Llansadwrn (Anglesey) Weather
Daily Observations 1999
at 0900 GMT
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Llansadwrn (Anglesey) Weather |
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CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR JANUARY 1999
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-09GMT--> -Air Temperature- --Soil temp-- --Earth temp-- -State Grd.- Weather Rain Fr. Pch
DD N dd ff V ww Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 100cm E C Gr SS Rain SLHTGF Press hrs hrs Evap
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01 4 18 5 7 02 7.8 71 8.9 6.4 2.9 4.2 4.7 5.5 5.8 6.5 8.0 1 0 0 0 16.1 0040G0 993.8 5.8 0.0 1.9
02 7 22 5 6 02 7.1 77 7.1 5.5 4.8 5.0 5.5 5.7 6.2 6.5 7.8 1 1 3 0 7.8 0000G0 982.1 6.2 0.0 1.6
03 6 36 1 5 21 4.2 97 11.2 3.3 2.9 4.5 4.8 5.5 5.9 6.5 7.8 2 3 3 0 2.6 0000G0 992.1 5.9 0.0 1.4
04 7 22 6 6 01 9.0 75 11.5 4.2 1.8 6.5 6.5 6.5 6.3 6.5 7.8 1 1 0 0 14.5 0000G0 992.5 6.3 0.0 1.6
05 8 18 6 5 63 11.5 95 11.6 6.1 5.5 9.5 8.3 7.0 6.8 6.9 7.9 2 3 3 0 31.2 0000G0 1000.1 6.8 0.0 0.2
06 8 22 1 5 60 6.7 98 7.3 6.6 6.2 7.5 7.9 8.0 7.8 7.5 7.8 2 3 3 0 1.0 000000 1004.2 7.8 0.0 0.1
07 5 22 2 7 02 5.6 95 7.6 3.8 -0.5 5.0 5.6 6.5 7.2 7.5 7.8 1 2 1 0 8.6 004000 1004.2 7.2 0.0 0.3
08 6 00 0 7 01 2.0 98 6.5 1.5 -2.0 2.5 4.0 5.5 6.5 7.2 7.9 1 2 5 0 tr 000000 999.3 6.5 0.0 0.5
09 3 36 1 7 03 1.9 93 6.0 1.0 -2.4 1.5 2.8 4.6 5.8 6.8 8.0 1 2 7 0 tr 003000 1015.4 5.8 0.0 0.3
10 0 45 1 7 04 -1.0 100 4.6 -1.7 -6.3 0.5 1.5 3.1 4.9 6.2 7.9 3 4 7 0 0.0 000000 1017.8 4.9 10.7 0.7
11 1 45 1 7 04 1.8 87 6.1 -1.0 -4.8 0.2 1.0 2.5 3.4 5.3 7.7 3 4 7 0 22.5 000000 1020.1 3.4 0.0 1.3
12 6 32 1 6 21 6.1 98 6.4 0.4 -4.2 3.3 2.8 2.8 3.2 4.9 7.5 2 2 4 0 1.0 000000 996.8 3.2 0.0 0.3
13 8 22 1 5 61 4.5 92 8.5 2.1 -1.3 3.0 3.0 3.2 4.0 4.8 7.2 2 3 3 0 3.7 000000 1006.3 4.0 0.0 0.9
14 2 27 1 6 03 2.8 89 9.4 2.9 0.5 2.2 3.2 4.1 4.4 5.0 6.9 1 1 1 0 8.2 0000G0 1004.6 4.4 0.0 1.6
15 8 22 7 5 63 8.0 94 10.5 2.6 1.2 6.5 6.2 5.5 5.2 5.3 7.0 2 3 3 0 19.3 0000G0 989.5 5.2 0.0 0.5
16 5 27 5 7 01 3.5 71 6.0 2.3 0.0 2.7 4.0 5.3 5.8 5.9 7.0 1 1 3 0 0.9 000000 987.8 5.8 0.0 2.0
17 6 22 4 7 03 4.6 77 6.7 2.9 0.6 2.3 3.0 4.0 4.9 5.6 6.9 1 2 4 0 3.7 004000 993.8 4.9 0.0 1.0
18 8 22 5 7 21 5.5 87 10.2 3.7 1.6 3.8 3.7 4.0 4.5 5.4 7.0 2 2 3 0 9.5 0000G0 1004.6 4.5 0.0 1.1
19 7 22 4 5 63 10.0 93 10.2 6.7 4.4 8.1 7.3 6.0 5.7 5.7 7.0 2 3 3 0 13.1 000000 995.1 5.7 0.0 0.7
20 6 22 4 6 21 8.3 92 9.5 7.6 6.7 7.2 7.2 6.9 6.5 6.3 6.9 2 2 3 0 tr 000000 1000.5 6.5 0.0 0.4
21 1 22 1 7 04 2.4 95 7.8 1.5 -3.2 1.5 3.0 5.0 5.8 6.3 6.9 1 2 7 0 0.1 000000 1020.4 5.8 0.0 0.5
22 6 22 1 7 03 2.5 91 7.6 1.0 -3.6 0.8 1.7 3.5 4.7 5.8 6.9 3 4 7 0 0.2 000000 1025.4 4.7 0.0 1.6
23 8 18 5 7 03 7.6 75 8.6 2.5 1.0 4.2 4.0 4.0 4.4 5.3 7.0 1 1 3 0 3.7 000000 1010.3 4.4 0.0 0.8
24 8 22 2 7 02 6.5 95 10.5 4.0 2.0 4.0 4.2 4.6 4.9 5.5 7.0 1 2 3 0 3.9 0000G0 1013.1 4.9 0.0 0.8
25 8 22 1 7 02 5.0 95 7.3 5.0 4.6 6.4 6.7 6.5 6.0 5.8 6.8 1 2 3 0 1.7 004000 1000.9 6.0 0.0 1.1
26 6 22 3 7 02 6.0 83 6.0 4.3 2.1 4.2 4.6 5.3 5.8 6.2 6.9 1 1 0 0 10.5 005000 1005.5 5.8 0.0 0.2
27 8 32 1 7 03 1.7 98 9.1 0.6 -3.2 1.2 2.2 4.0 5.0 5.8 6.9 3 4 5 0 4.5 000000 1013.9 5.0 0.0 0.6
28 8 00 0 5 61 7.4 97 7.5 1.7 0.0 6.8 6.5 6.0 5.7 5.8 6.9 2 3 3 0 0.5 000000 1013.5 5.7 0.0 0.2
29 9 22 1 6 02 6.1 98 8.5 5.1 2.4 5.6 5.6 5.9 5.8 6.1 7.0 1 2 3 0 3.3 000000 1027.6 5.8 0.0 0.0
30 7 00 0 1 45 8.0 100 9.7 6.0 5.7 7.0 7.0 6.8 6.3 6.3 7.0 1 2 2 0 1.3 00000F 1035.2 6.3 0.0 0.0
31 7 00 0 7 02 7.3 99 9.3 7.1 4.9 7.0 7.2 7.2 7.0 7.0 7.0 1 2 1 0 0.0 000000 1039.4 7.0 0.0 0.4
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Mean
6 5.5 91 8.3 3.4 1.0 4.3 4.7 5.2 5.6 6.1 7.3 1006.6
Total 193.4 172.2 10.7 24.6
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(.) Difference from 1989-98 average used by the Climatological Observers Link. Rainfall was 208% of average
Air temperatures Weather (No. days occurrence) and 202% of 1961-90 average.
Mean maximum 8.3 (+0.4) Sleet/snow falling 0 (-2.0) Most in a day: 31.2 mm on 5th.
Mean minimum 3.4 (+0.5) Snow lying (at 09GMT) 0 (-0.5) No. days with:
Mean 5.9 (+0.5) Hail <5 mm 5 [+3.2] >=0.2 mm 25 (+ 6.8)
No. days <0.0C 2 (-3.9) Hail >=5 mm 1 [all hail] >=1.0 mm 22 (+ 7.5)
Mean grass min 1.0 (+0.3) Thunder heard 0 (-0.5) >=5.0 mm 11 (+ 4.7)
Lowest grass min -6.3 (+0.4) Gales 9 Lysimeter:
No. days <0.0C 10 (-3.8) Fog (at 09GMT) 1 PE 9.2 mm
PWB 184.2 mm
Highest maximum 11.6C on 5th. Lowest minimum -1.7 on 10th. PWS 184.2 mm
Minimum relative humidity: 62% on 16th PWD 0.0 mm
* Wettest January since 1948 (231 mm) and second wettest on 70 year record. Piche: 24.6 ml
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Key: Observations at 09GMT...
DD date; N cloud (oktas, 9=obscured); dd wind direction (8 sectors, degrees/10); ff wind speed (Beaufort scale);
V visibility (0 dense fog, 1 thick fog, 2 fog, 3 moderate fog, 4 very poor, 5 poor, 6 moderate, 7 good, 8 very good);
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 04 smoke haze, 21 recent rain,
45 fog past hour, 61 continuous slight rain, 63 continuous moderate rain.
Temperatures (degC); RH relative humidity (%); soil temperatures are under bare soil and earth under grass (degC);
SS snow depth (cm); Press air pressure, aneroid (mb). For state of the ground E, concrete C, and grass Gr codes consult
'Recording Atmospheric Depositions on Grass' page.
24 hour observations...
Max maximum temperature (degC) beginning 09GMT; Min minimum temperature ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning 09GMT;
Rain rainfall beginning 09GMT (mm); Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of frost (00-24GMT).
Monthly observations...
PE Potential evapotranspiration, PWB Potential water balance, PWS Potential water surplus, PWD Potential water deficit.
Weather: days with...
s slight or S heavy snow/sleet falling; L >=50% snow cover at 09GMT; H categories of hail: 3 snow pellets,
4 ice pellets, 5 hail 5-9 mm, 6 hail 10-19 mm; t slight or T heavy thunder heard; G gale; F fog at 09GMT.
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CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR FEBRUARY 1999
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-09GMT--> -Air Temperature- --Soil temp-- --Earth temp-- -State Grd.- Weather Rain Fr. Pch
DD N dd ff V ww Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 100cm E C Gr SS Rain SLHTGF Press hrs hrs Evap
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01 7 SW 1 5 01 6.9 96 10.1 6.6 6.0 6.9 7.0 7.2 7.2 7.2 7.2 1 1 1 0 0.0 000000 1041.9 0.0 0.0 0.8
02 7 SW 3 7 03 6.3 89 8.6 4.2 0.6 4.6 5.2 6.0 6.7 7.1 7.3 1 1 1 0 0.0 000000 1040.8 0.0 0.0 0.6
03 8 SW 4 5 02 8.5 97 9.5 6.2 5.4 7.5 7.3 7.0 7.0 7.0 7.3 1 0 1 0 0.0 000000 1035.9 0.0 0.0 0.7
04 8 W 5 5 02 9.5 89 13.0 8.3 7.8 8.3 8.0 7.8 7.5 7.2 7.4 1 0 0 0 0.8 000000 1025.7 2.2 0.0 1.3
05 7 NW 3 6 01 6.6 85 8.2 5.9 3.8 5.9 6.4 7.1 7.3 7.4 7.4 1 2 3 0 3.2 000000 1024.6 4.1 0.0 0.6
06 8 NW 2 6 02 6.0 92 7.0 5.5 4.1 5.6 6.0 6.6 7.1 7.3 7.6 1 2 3 0 4.8 000000 1018.9 7.0 0.0 0.4
07 5 N 1 7 87 2.0 85 5.7 0.5 -1.7 2.0 3.3 5.3 6.5 7.1 7.6 6 6 6 0 2.8 S05000 1013.9 5.0 0.0 0.6
08 8 NW 1 4 71 1.2 96 4.0 1.0 -1.6 2.6 3.4 4.5 5.3 6.5 7.5 1 5 9 0 0.7 s05000 1004.2 3.5 0.0 0.6
09 3 N 3 7 01 1.2 72 5.7 -0.3 -2.2 0.6 1.7 3.5 4.8 6.0 7.5 3 0 6 0 tr s03000 1008.3 0.0 2.8 1.8
10 2 N 2 8 01 1.5 72 6.6 -0.5 -5.0 0.3 1.3 2.8 4.2 5.5 7.3 3 0 6 0 1.0 005000 1015.4 1.3 0.0 0.6
11 7 N 1 8 02 2.3 95 8.6 0.8 -1.6 1.8 2.2 3.1 3.8 5.2 7.2 1 2 5 0 0.0 004000 1021.2 0.0 0.0 0.7
12 8 SW 1 7 03 5.5 89 7.0 1.8 -2.1 3.3 3.3 3.6 4.1 5.1 7.0 1 0 1 0 2.2 000000 1023.1 3.8 0.0 0.3
13 5 00 0 1 42 4.3 100 10.7 1.9 -1.5 4.0 4.0 4.7 4.8 5.3 6.9 1 2 2 0 0.8 00000F 1030.9 2.0 0.0 0.9
14 8 SW 4 5 61 6.7 97 8.0 4.3 2.5 6.0 5.8 5.5 5.6 5.8 6.8 1 3 3 0 5.5 000000 1027.2 6.2 0.0 0.1
15 7 SW 1 7 03 5.2 97 8.3 2.9 0.0 5.0 5.0 5.3 5.4 6.0 6.9 1 2 1 0 0.6 000000 1025.4 1.2 0.0 0.6
16 1 NW 2 7 01 4.0 83 9.2 3.1 -0.2 4.0 5.0 5.8 5.8 6.2 6.9 1 2 1 0 1.6 000000 1018.9 0.6 0.0 0.9
17 7 NW 1 7 01 4.7 93 8.5 3.6 1.7 4.5 4.8 5.4 5.8 6.1 6.9 1 2 4 0 2.0 004000 1018.9 4.0 0.0 0.4
18 8 NW 2 7 02 7.8 97 9.8 4.7 4.3 6.2 6.2 6.3 6.2 6.3 6.9 1 2 3 0 5.9 000000 1018.5 5.5 0.0 0.3
19 8 SW 2 4 20 9.5 100 9.7 7.8 7.7 8.5 8.0 7.4 7.0 6.7 7.0 1 2 3 0 0.7 000000 1011.1 0.6 0.0 0.5
20 7 SW 1 7 05 4.9 90 7.8 2.7 0.0 4.3 4.9 6.2 6.5 7.0 7.2 1 0 1 0 5.2 004000 1016.2 5.1 0.0 1.1
21 8 NW 5 5 80 6.9 94 8.7 4.9 4.1 6.0 6.1 6.3 6.7 6.8 7.2 2 3 3 0 5.9 004000 1002.2 3.3 0.0 0.7
22 1 NW 5 6 01 2.7 89 8.5 1.2 -0.3 2.6 3.5 5.0 5.8 6.8 7.3 1 2 5 0 1.3 000000 1007.5 0.8 0.0 0.9
23 6 NW 1 6 01 1.8 94 7.0 0.5 -2.9 2.2 2.8 4.3 5.2 6.3 7.3 1 2 5 0 7.1 000000 1018.1 10.5 0.0 0.6
24 1 E 4 5 02 3.4 97 8.5 1.8 0.1 3.8 4.5 5.1 5.6 6.2 7.3 1 2 1 0 0.0 000000 1006.7 0.0 0.0 0.7
25 7 SW 4 5 02 7.0 94 9.5 2.7 -0.5 5.8 5.7 5.6 5.8 6.2 7.3 1 0 1 0 0.7 0000G0 1016.2 0.7 0.0 0.4
26 7 SW 4 4 01 7.7 97 9.6 6.0 4.5 6.6 6.5 6.6 6.6 6.6 7.3 1 2 3 0 0.1 0000G0 1007.5 0.0 0.0 1.0
27 3 SW 4 7 03 4.7 76 8.1 3.3 1.1 3.3 4.3 5.9 6.3 6.6 7.3 1 0 1 0 0.0 000000 1003.8 0.0 0.0 2.0
28 8 SW 7 6 02 8.1 81 10.2 4.2 2.5 6.0 5.5 5.5 6.0 6.5 7.3 1 0 0 0 10.9 0000G0 1008.3 10.9 0.0 0.8
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Mean
6 5.2 91 8.4 3.4 1.3 4.6 4.9 5.5 6.0 6.4 7.2 1018.3
Total 63.8 78.3 2.8 20.9
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(.) Difference from 1989-98 average used by the Climatological Observers Link. Rainfall was 65% of average
Air temperatures Weather (No. days occurrence) and 95% of 1961-90 average.
Mean maximum 8.4 (-0.1) Sleet/snow falling 3 (-0.2) Most in a day: 10.9 mm on 28th.
Mean minimum 3.4 (+0.5) Snow lying (at 09GMT) 0 (-1.2) No. days with:
Mean 5.9 (+0.2) Hail <5 mm 5 [+5.1] >=0.2 mm 20 (+ 1.5)
No. days <0.0C 2 (-3.0) Hail >=5 mm 3 [all hail] >=1.0 mm 14 (- 0.2)
Mean grass min 1.3 (+0.3) Thunder heard 0 (-0.7) >=5.0 mm 6 (+ 0.8)
Lowest grass min -5.0 (+0.2) Gales 3 Lysimeter:
No. days <0.0C 11 (-0.4) Fog (at 09GMT) 1 PE 27.3 mm
PWB 36.5 mm
Highest maximum 13.0C on 4th. Lowest minimum -0.5 on 10th. PWS 37.0 mm
Minimum relative humidity: 60% on 9th PWD -0.5 mm
* Piche: 20.9 ml
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Key: Observations at 09GMT...
DD date; N cloud (oktas, 9=obscured); dd wind direction (8 sectors, 00=calm); ff wind speed (Beaufort scale);
V visibility (0 dense fog, 1 thick fog, 2 fog, 3 moderate fog, 4 very poor, 5 poor, 6 moderate, 7 good, 8 very good);
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 05 haze, 20 drizzle in past hr,
42 fog thinning, 61 continuous slight rain, 71 slight snow, 80 slight rain shower, 87 shower of snow pellets.
Temperatures (degC); RH relative humidity (%); soil temperatures are under bare soil and earth under grass (degC);
SS snow depth (cm); Press air pressure, aneroid (mb). For state of the ground E, concrete C, and grass Gr codes consult
'Recording Atmospheric Depositions on Grass' page.
24 hour observations...
Max maximum temperature (degC) beginning 09GMT; Min minimum temperature ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning 09GMT;
Rain rainfall beginning 09GMT (mm); Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of frost (00-24GMT).
Monthly observations...
PE Potential evapotranspiration, PWB Potential water balance, PWS Potential water surplus, PWD Potential water deficit.
Weather: days with...
s slight or S heavy snow/sleet falling; L >=50% snow cover at 09GMT; H categories of hail: 3 snow pellets,
4 ice pellets, 5 hail 5-9 mm, 6 hail 10-19 mm; t slight or T heavy thunder heard; G gale; F fog at 09GMT.
CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR MARCH 1999
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-09GMT--> -Air Temperature- --Soil temp-- --Earth temp-- -State Grd.- Weather Rain Fr. Pch
DD N dd ff V ww Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 100cm E C Gr SS Rain SLHTGF Press hrs hrs Evap
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01 8 W 4 5 02 10.2 96 10.7 6.9 5.8 8.5 7.8 7.0 6.7 6.5 7.3 1 2 3 0 20.6 000000 1002.2 11.0 0.0 0.1
02 8 SW 3 2 46 9.5 99 9.5 8.5 7.8 8.7 8.4 8.0 7.5 7.2 7.2 2 3 3 0 22.1 0000GF 999.7 10.8 0.0 0.7
03 7 SW 5 6 01 7.0 90 8.7 5.9 5.3 6.8 6.8 7.2 7.4 7.5 7.5 1 2 3 0 2.4 000000 973.2 4.0 0.0 0.6
04 6 N 3 6 25 3.5 90 4.5 2.5 1.1 4.5 5.2 6.5 6.9 7.3 7.5 1 2 3 0 2.8 s04000 987.4 5.2 0.0 1.6
05 6 N 4 8 02 3.7 70 6.5 2.3 0.5 2.6 3.2 4.8 5.8 6.8 7.7 1 0 0 0 2.7 005000 997.2 1.3 0.0 1.2
06 6 N 1 8 02 3.2 84 7.4 0.6 -1.8 2.3 3.0 4.5 5.3 6.3 7.5 1 2 4 0 5.6 004000 1000.5 11.1 0.0 0.7
07 8 N 3 5 61 3.5 95 4.8 2.4 -0.9 4.0 4.3 5.0 5.7 6.3 7.4 2 3 3 0 2.5 s04000 1002.6 4.5 0.0 0.5
08 7 E 1 7 02 3.8 87 5.0 2.5 1.0 4.0 4.1 4.9 5.4 6.1 7.3 1 1 3 0 0.6 000000 1002.6 3.8 0.0 0.5
09 7 NE 3 7 01 4.3 87 7.2 2.9 0.8 4.0 4.2 4.8 5.3 6.0 7.2 1 0 3 0 0.8 000000 1006.3 1.3 0.0 0.6
10 5 NE 1 7 05 3.4 97 9.3 1.6 -1.2 3.0 3.7 4.8 5.1 6.1 7.1 1 3 4 0 0.0 000000 1014.2 0.0 0.0 0.9
11 6 NE 1 7 03 3.2 83 7.7 -0.9 -5.4 1.2 2.2 4.0 4.9 6.1 7.1 3 0 5 0 0.8 000000 1011.5 0.9 7.6 0.7
12 7 SW 1 6 01 7.7 94 11.7 3.2 0.4 6.5 6.0 5.6 5.7 5.8 7.0 1 2 3 0 0.0 000000 1005.5 0.0 0.0 1.2
13 1 SW 3 7 01 7.0 78 11.0 4.9 3.2 5.0 5.5 5.4 6.5 6.5 7.0 1 0 1 0 0.0 000000 1009.5 0.0 0.0 1.8
14 7 SW 4 6 03 7.7 94 12.0 5.8 4.7 6.3 6.0 6.3 6.6 6.7 7.2 1 0 1 0 0.0 000000 1020.8 0.0 0.0 1.3
15 4 SW 3 7 05 8.3 87 12.5 6.6 5.4 6.5 6.5 7.0 7.2 7.1 7.2 1 0 1 0 0.2 000000 1026.1 1.0 0.0 2.0
16 6 SW 3 7 01 8.7 97 15.5 7.2 6.3 8.2 7.7 7.5 7.5 7.3 7.3 1 2 3 0 0.0 000000 1028.3 0.0 0.0 1.2
17 4 00 0 3 42 7.4 99 16.9 5.5 3.6 7.5 7.4 8.0 8.2 7.8 7.3 1 0 2 0 0.4 000000 1030.2 0.3 0.0 1.9
18 2 NW 2 6 01 7.5 88 11.8 5.0 2.5 7.2 7.6 8.5 8.7 8.3 7.6 1 2 3 0 0.0 000000 1027.6 0.0 0.0 1.0
19 6 NW 2 5 01 7.4 90 11.5 3.4 0.6 7.2 7.0 7.7 8.3 8.3 7.8 1 2 3 0 0.0 000000 1030.9 0.0 0.0 0.8
20 7 W 1 7 02 7.5 81 9.6 4.5 1.6 7.7 7.5 8.0 8.3 8.3 7.9 1 0 1 0 8.3 000000 1029.4 2.4 0.0 1.1
21 6 NW 5 6 01 7.0 88 10.5 6.1 4.8 7.3 7.5 8.0 8.3 8.3 8.0 1 0 1 0 0.4 000000 1003.4 1.1 0.0 1.1
22 8 N 1 7 02 6.2 82 9.0 4.3 2.9 6.4 6.3 7.1 7.8 8.2 8.2 1 2 3 0 2.2 000000 1018.1 2.9 0.0 0.4
23 8 SW 2 6 10 8.3 92 10.9 5.9 5.8 7.8 7.8 7.8 8.0 8.1 8.0 1 0 1 0 0.2 000000 1012.3 0.0 0.0 0.7
24 8 SW 4 6 60 8.6 92 9.6 7.7 7.1 8.1 8.2 8.2 8.4 8.3 8.1 1 2 3 0 7.8 000000 1005.1 9.2 0.0 0.4
25 8 00 0 4 60 5.7 98 7.6 5.3 4.9 7.0 7.3 8.0 8.2 8.4 8.1 1 3 3 0 0.6 000000 1000.1 1.1 0.0 0.6
26 3 W 2 7 02 6.1 77 10.3 0.6 -2.3 4.5 5.0 6.8 7.7 8.2 8.2 1 1 4 0 tr 000000 998.9 0.0 0.0 1.0
27 6 W 1 7 01 7.5 84 10.8 3.0 -0.7 6.7 6.2 6.9 7.8 8.0 8.2 1 0 4 0 0.0 000000 1004.2 0.0 0.0 0.8
28 6 S 5 7 03 7.6 77 10.5 3.4 -0.3 5.7 5.7 6.8 7.6 8.0 8.2 1 0 1 0 11.2 0000G0 1009.5 10.6 0.0 1.8
29 8 SW 5 5 61 9.5 97 12.7 7.6 7.0 9.2 8.8 8.3 8.2 8.2 8.2 1 3 3 0 tr 0000G0 1004.2 0.0 0.0 1.2
30 5 SW 3 6 01 9.9 86 14.0 8.2 7.2 9.0 8.5 8.5 8.8 8.5 8.2 1 0 1 0 0.8 000000 1012.7 1.0 0.0 1.3
31 7 SW 3 7 02 10.2 82 15.6 7.0 3.9 9.6 9.4 9.3 9.3 8.9 8.4 1 2 3 0 tr 000000 1011.5 0.0 0.0 3.1
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Mean
6 6.8 88 10.2 4.5 2.6 6.2 6.3 6.8 7.2 7.4 7.6 1009.2
Total 93.0 83.5 7.6 32.8
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(.) Difference from 1989-98 average used by the Climatological Observers Link. Rainfall was 106% of average
Air temperatures Weather (No. days occurrence) and 119% of 1961-90 average.
Mean maximum 10.2 (-0.2) Sleet/snow falling 2 (+0.8) Most in a day: 22.1 mm on 2nd.
Mean minimum 4.5 (+0.3) Snow lying (at 09GMT) 0 (-0.3) No. of days with:
Mean 7.4 (+0.1) Hail <5 mm 3 [+3.5] >=0.2 mm 20 (+ 2.4)
No. days <0.0C 1 (-0.7) Hail >=5 mm 1 [all hail] >=1.0 mm 11 (- 1.9)
Mean grass min 2.6 (+0.3) Thunder heard 0 (-0.5) >=5.0 mm 6 (+ 0.1)
Lowest grass min -5.4 (-1.4) Gales 2 Lysimeter:
No. days <0.0C 7 (-2.0) Fog (at 09GMT) 1 PE 60.3 mm
PWB 32.7 mm
Highest maximum 16.9 on 17th. Lowest minimum -0.9C on 11th. PWS 42.8 mm
Minimum relative humidity: 59% on 17th and 26th. PWD -10.1 mm
* Piche: 32.8 ml
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Key: Observations at 09GMT...
DD date; N cloud (oktas, 9=obscured); dd wind direction (8 sectors, 00=calm); ff wind speed (Beaufort scale);
V visibility (0 dense fog, 1 thick fog, 2 fog, 3 moderate fog, 4 very poor, 5 poor, 6 moderate, 7 good, 8 very good);
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 05 haze, 25 rain shower in past
hour, 42 fog thinning, 46 fog thicker in past hour, 60 intermittent slight rain, 61 continuous slight rain.
Temperatures (degC); RH relative humidity (%); soil temperatures are under bare soil and earth under grass (degC);
SS snow depth (cm); Press air pressure, aneroid (mb). For state of the ground E, concrete C, and grass Gr codes consult
'Recording Atmospheric Depositions on Grass' page.
24 hour observations...
Max maximum temperature (degC) beginning 09GMT; Min minimum temperature ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning 09GMT;
Rain rainfall beginning 09GMT (mm); Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of frost (00-24GMT).
Monthly observations...
PE Potential evapotranspiration, PWB Potential water balance, PWS Potential water surplus, PWD Potential water deficit.
Weather: days with...
s slight or S heavy snow/sleet falling; L >=50% snow cover at 09GMT; H categories of hail: 3 snow pellets,
4 ice pellets, 5 hail 5-9 mm, 6 hail 10-19 mm; t slight or T heavy thunder heard; G gale; F fog at 09GMT.
------------------------------------------------------------------------------------------------------------------------
CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR APRIL 1999
------------------------------------------------------------------------------------------------------------------------
-09GMT--> -Air Temperature- --Soil temp-- --Earth temp-- -State Grd.- Weather Rain Fr. Pch
DD N dd ff V ww Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 100cm E C Gr SS Rain SLHTGF Press hrs hrs Evap
------------------------------------------------------------------------------------------------------------------------
01 7 SE 2 6 05 14.5 63 19.6 10.2 7.7 10.5 9.9 9.7 9.8 9.3 8.5 0 0 1 0 1.5 000000 1009.5 0.8 0.0 2.8
02 3 S 1 5 05 12.0 74 14.2 8.7 7.0 10.5 10.3 10.5 10.5 10.0 8.8 1 2 3 0 2.2 000000 1012.3 2.2 0.0 0.8
03 6 00 0 8 01 10.2 85 17.5 4.9 2.5 10.0 9.3 9.6 10.0 10.0 8.9 1 2 1 0 tr 000000 1017.4 0.0 0.0 1.3
04 8 SW 2 5 50 11.9 95 15.6 9.6 8.0 11.6 11.0 10.9 11.0 10.2 9.0 1 1 3 0 2.4 000000 1022.0 1.9 0.0 1.0
05 8 S 5 5 10 10.6 99 12.1 10.0 9.8 11.2 11.0 11.0 11.1 10.5 9.1 1 2 3 0 4.1 000000 1020.4 3.5 0.0 0.5
06 5 SW 6 6 10 10.9 86 12.5 9.3 8.4 10.8 10.8 10.6 10.9 10.8 9.5 1 0 3 0 1.9 000000 1014.6 2.0 0.0 0.6
07 8 W 3 7 01 7.6 94 14.5 6.0 2.9 8.5 8.9 9.8 10.5 10.5 9.3 1 2 3 0 1.1 000000 1040.1 3.9 0.0 0.8
08 9 SW 1 4 20 10.4 99 13.4 6.5 3.1 10.5 10.0 10.1 10.8 10.8 9.5 1 2 3 0 tr 000000 1025.4 0.0 0.0 0.7
09 8 SW 3 5 10 10.3 94 14.5 10.3 9.4 11.3 11.1 10.9 11.0 10.9 9.5 1 0 3 0 10.0 000000 1023.9 3.0 0.0 1.0
10 7 W 3 7 25 8.9 92 13.3 7.9 6.7 10.2 10.0 10.5 11.0 10.7 9.8 1 2 3 0 0.0 000000 1015.8 0.0 0.0 1.2
11 6 W 3 7 03 8.5 84 11.3 4.2 1.1 8.2 7.8 9.2 10.5 10.9 9.9 1 0 1 0 14.6 0000G0 1020.8 7.1 0.0 1.2
12 8 W 2 5 60 7.5 97 13.5 5.4 4.2 8.8 8.6 9.1 10.1 10.6 10.0 1 3 3 0 1.8 000000 992.5 3.1 0.0 0.8
13 7 NW 6 7 79 5.4 75 9.0 3.4 0.2 7.0 7.3 8.8 10.0 10.3 9.8 1 2 6 0 6.6 s050G0 1004.2 4.5 0.0 1.3
14 5 N 1 7 87 4.3 71 9.2 -0.5 -4.5 4.0 5.0 7.5 9.4 10.0 10.0 6 5 9 2 6.3 S13000 998.0 7.2 5.1 0.6
15 7 N 2 5 87 4.5 98 8.7 -0.2 -1.7 5.0 5.1 6.7 8.6 9.3 9.8 3 3 4 0 1.2 s04000 999.0 2.0 1.1 0.8
16 6 00 0 8 03 5.7 71 11.1 -0.1 -2.9 5.3 4.8 6.5 8.2 8.9 9.6 1 0 4 0 5.7 000000 1001.8 4.1 2.2 0.7
17 6 NE 1 7 02 6.2 86 11.6 3.0 1.4 7.1 6.7 7.3 8.5 8.9 9.5 1 2 3 0 4.0 000000 1011.5 5.0 0.0 0.8
18 7 W 2 7 03 5.9 89 10.6 3.0 0.4 8.0 7.3 8.0 8.9 9.0 9.3 1 2 3 0 0.0 000000 1014.2 0.0 0.0 1.1
19 1 00 0 8 02 6.9 63 13.8 0.9 -2.5 5.3 5.5 7.5 8.9 9.3 9.5 1 0 4 0 3.1 000000 1016.6 5.5 0.0 2.1
20 8 SE 2 7 60 8.1 86 12.5 5.2 4.5 8.0 8.2 9.0 9.8 9.8 9.2 1 3 3 0 8.6 000000 993.8 9.0 0.0 1.6
21 8 S 6 5 61 9.1 89 10.5 7.9 7.0 9.5 9.0 9.0 9.6 9.6 9.4 2 3 3 0 1.9 0000G0 979.9 8.0 0.0 1.2
22 7 SW 5 5 80 8.5 85 12.5 8.0 7.0 8.8 8.7 9.0 9.5 9.5 9.5 1 3 3 0 1.0 000000 994.7 1.2 0.0 1.6
23 7 SW 1 7 25 9.0 86 14.0 6.5 5.1 9.5 8.7 9.0 9.8 9.8 9.5 1 2 3 0 0.4 000000 1004.6 0.4 0.0 1.5
24 7 SW 1 5 01 9.5 89 14.2 7.6 5.7 11.1 10.5 10.1 10.5 10.1 9.5 1 1 3 0 0.9 000000 1013.5 2.8 0.0 1.4
25 8 00 0 7 21 9.8 89 11.7 7.0 5.1 10.7 10.5 10.5 11.0 10.5 9.6 1 2 3 0 2.7 000000 1010.3 8.1 0.0 0.9
26 9 NE 2 4 10 9.5 92 12.8 8.5 7.7 11.0 10.5 10.3 10.8 11.0 9.8 1 2 3 0 1.1 000000 1016.6 2.0 0.0 0.6
27 5 E 4 4 05 11.4 88 17.1 8.2 7.4 12.2 10.8 10.5 11.0 10.8 10.0 1 0 1 0 0.0 000000 1029.4 0.0 0.0 1.4
28 1 NE 1 7 05 14.1 65 18.2 7.3 4.8 12.3 12.5 11.0 11.8 11.5 10.1 1 0 1 0 0.0 000000 1032.0 0.0 0.0 1.8
29 4 NE 2 7 05 13.5 75 17.7 7.8 5.4 13.0 11.3 11.9 12.5 12.1 10.2 0 0 1 0 0.0 000000 1023.9 0.0 0.0 1.2
30 8 N 1 5 05 9.5 89 15.0 6.8 5.5 12.8 12.0 12.3 12.9 12.2 10.2 0 0 1 0 0.0 000000 1019.7 0.0 0.0 0.9
------------------------------------------------------------------------------------------------------------------------
Mean
6 9.1 85 13.4 6.1 4.2 9.4 9.1 9.6 10.3 10.3 9.5 1012.6
Total 83.1 87.3 8.4 34.2
------------------------------------------------------------------------------------------------------------------------
(.) Difference from 1989-98 average used by the Climatological Observers Link. Rainfall was 120% of average an
Air temperatures Weather (No. days occurrence) 138% of the 1961-90 average.
Mean maximum 13.4 (+0.9) Sleet/snow falling 3 (+1.2) Most in a day: 14.6 mm (11th).
Mean minimum 6.1 (+1.3) Snow lying (at 09GMT) 1 (+0.7) No. of days with:
Mean 9.8 (+1.1) Hail <5 mm 2 [+0.8] >=0.2 mm 22 (+ 5.4)
No. days <0.0C 3 (+2.1) Hail >=5 mm 1 [all hail] >=1.0 mm 20 (+ 7.5)
Mean grass min 4.2 (+1.2) Thunder heard 0 (-0.3) >=5.0 mm 6 (+ 1.6)
Lowest grass min -4.5 (-1.6) Gales 3 Lysimeter:
No. days <0.0C 4 (-2.0) Fog (at 09GMT) 0 PE 56.2 mm
PWB 26.9 mm
Highest maximum 19.6C on 1st. Lowest minimum -0.5 on 14th. PWS 38.3 mm
Minimum relative humidity: 45% on 19th. Wettest April since 1994. PWD -11.4 mm
* Highest mean minimum 6.1C and second highest mean 9.8C in 20 years records. Piche: 34.2 ml
------------------------------------------------------------------------------------------------------------------------
Key: Observations at 09GMT...
DD date; N cloud (oktas, 9=obscured); dd wind direction (8 sectors, 00=calm); ff wind speed (Beaufort scale);
V visibility (0 dense fog, 1 thick fog, 2 fog, 3 moderate fog, 4 very poor, 5 poor, 6 moderate, 7 good, 8 very good);
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 05 haze, 10 mist,
20 drizzle in past hour, 21 rain in past hr, 25 rain shower in past hr, 50 slight intermittent drizzle, 60 int. slight
rain, 61 continuous slight rain, 79 ice pellets, 80 slight rain shower, 87 shower of snow pellets.
Temperatures (degC); RH relative humidity (%); soil temperatures are under bare soil and earth under grass (degC);
SS snow depth (cm); Press air pressure, aneroid (mb). For state of the ground E, concrete C, and grass Gr codes consult
'Recording Atmospheric Depositions on Grass' page.
24 hour observations...
Max maximum temperature (degC) beginning 09GMT; Min minimum temperature ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning 09GMT;
Rain rainfall beginning 09GMT (mm); Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of frost (00-24GMT).
Monthly observations...
PE Potential evapotranspiration, PWB Potential water balance, PWS Potential water surplus, PWD Potential water deficit.
Weather: days with...
s slight or S heavy snow/sleet falling; L >=50% snow cover at 09GMT; H categories of hail: 3 snow pellets,
4 ice pellets, 5 hail 5-9 mm, 6 hail 10-19 mm; t slight or T heavy thunder heard; G gale; F fog at 09GMT.
------------------------------------------------------------------------------------------------------------------------
CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR MAY 1999
------------------------------------------------------------------------------------------------------------------------
-09GMT--> -Air Temperature- --Soil temp-- --Earth temp-- -State Grd.- Weather Rain Fr. Pch
DD N dd ff V ww Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 100cm E C Gr SS Rain SLHTGF Press hrs hrs Evap
------------------------------------------------------------------------------------------------------------------------
01 5 N 2 7 01 9.6 83 13.5 5.0 3.3 12.6 11.5 12.0 12.8 12.3 10.5 0 0 1 0 0.0 000000 1020.8 0.0 0.0 1.1
02 8 S 1 7 02 11.2 88 18.8 6.2 4.5 12.0 11.8 12.2 13.0 12.5 10.9 0 0 1 0 0.0 000000 1022.0 0.0 0.0 1.4
03 1 SE 1 5 05 14.7 76 20.0 7.1 4.9 13.7 11.5 12.0 13.1 12.7 11.0 0 0 1 0 0.0 000000 1022.0 0.0 0.0 2.4
04 3 NE 1 6 05 17.2 60 21.2 11.1 8.6 16.1 13.9 13.7 14.3 13.5 11.2 0 0 1 0 0.0 000000 1019.3 0.0 0.0 2.5
05 7 E 4 7 05 11.7 77 15.8 9.0 7.4 14.5 13.4 13.8 14.3 13.8 11.3 0 0 0 0 0.5 000000 1012.3 1.5 0.0 1.5
06 7 S 1 5 05 15.0 76 18.8 10.2 8.8 15.5 14.2 14.0 14.3 13.8 11.4 0 0 1 0 1.6 000000 1010.7 2.4 0.0 1.0
07 8 S 1 6 61 12.2 87 17.0 7.2 4.7 11.6 11.7 12.5 13.5 13.5 11.6 1 3 3 0 8.1 000000 1008.7 7.7 0.0 0.8
08 7 SW 5 6 80 13.0 85 15.0 8.7 7.1 14.0 12.4 12.5 13.5 13.2 11.8 1 2 3 0 7.7 000000 1005.5 8.6 0.0 1.3
09 8 S 4 5 10 12.7 86 16.5 11.6 10.9 12.8 12.5 12.9 13.5 13.2 11.7 1 1 3 0 0.5 000000 1009.5 1.4 0.0 2.9
10 8 SW 4 5 80 12.7 86 15.4 11.5 9.8 13.3 12.6 12.5 13.2 13.0 12.0 1 3 3 0 8.3 000000 1003.8 6.5 0.0 1.6
11 8 S 5 5 62 11.4 93 15.0 10.0 9.5 12.2 12.2 12.6 13.3 13.0 11.8 1 3 3 0 3.8 000000 1004.6 2.5 0.0 1.4
12 7 SW 5 7 01 11.6 93 15.0 9.8 8.5 13.0 12.5 12.6 13.3 13.2 11.9 1 2 3 0 3.3 000000 1005.5 2.6 0.0 1.4
13 8 S 4 5 81 11.2 92 13.5 9.9 9.6 13.0 12.5 12.6 13.3 13.2 11.9 1 3 3 0 11.9 000000 1005.9 7.0 0.0 0.5
14 9 NE 2 4 10 11.3 99 14.7 9.6 9.2 13.5 12.5 12.5 13.3 13.1 11.9 1 2 3 0 0.0 000000 1011.1 0.0 0.0 0.7
15 2 NE 1 7 01 11.7 85 16.0 7.9 6.2 14.6 13.0 13.1 14.0 13.6 12.0 1 0 1 0 0.0 000000 1022.0 0.0 0.0 0.8
16 5 N 1 7 01 11.6 81 15.2 6.6 4.6 14.5 13.1 13.4 14.4 14.0 12.1 0 0 1 0 0.0 000000 1024.2 0.0 0.0 1.2
17 7 E 3 7 03 8.6 74 12.8 7.3 6.0 12.0 12.5 13.7 14.6 14.4 12.2 0 0 1 0 0.0 000000 1025.4 0.0 0.0 2.2
18 7 E 5 6 05 10.5 80 18.3 7.7 6.9 11.8 11.8 12.8 13.8 14.0 12.3 0 0 0 0 0.2 000000 1018.9 0.0 0.0 2.0
19 6 NE 2 5 05 12.4 80 17.6 9.8 9.3 14.3 13.3 13.2 13.8 13.7 12.4 0 0 3 0 0.0 000000 1014.2 0.0 0.0 1.2
20 1 NE 1 7 02 14.3 73 18.6 8.3 6.5 14.5 13.2 13.8 14.5 14.0 12.3 0 0 1 0 2.4 000000 1016.2 2.8 0.0 1.8
21 8 SW 6 4 42 11.7 99 15.0 10.8 9.7 13.0 13.5 14.5 15.0 14.5 13.2 1 2 3 0 tr 000000 1009.1 0.0 0.0 1.8
22 5 W 5 7 01 11.5 70 14.6 7.0 5.4 11.6 10.8 12.2 13.8 14.5 13.5 0 0 1 0 tr 000000 1015.0 0.0 0.0 2.3
23 8 SW 5 5 50 12.2 92 16.0 11.1 10.0 12.7 12.6 13.0 13.8 14.2 13.4 0 0 0 0 2.3 000000 1015.4 2.5 0.0 1.1
24 8 SW 3 5 61 11.3 99 14.6 11.0 10.8 13.0 12.9 13.2 13.9 14.0 13.2 1 3 3 0 2.0 000000 1015.4 1.3 0.0 1.2
25 7 SW 3 7 03 11.1 68 14.0 5.6 2.2 11.5 11.2 12.1 13.5 14.0 13.2 1 0 1 0 0.7 000000 1019.3 0.6 0.0 2.5
26 8 S 4 5 42 12.3 99 16.5 9.9 8.8 13.0 12.5 12.8 13.5 13.8 13.2 1 2 3 0 0.0 000000 1015.4 0.0 0.0 1.5
27 5 00 0 7 01 16.5 76 22.8 9.4 9.4 13.4 12.3 12.9 13.7 13.9 13.4 0 0 1 0 8.1 000000 1016.6 4.8 0.0 1.3
28 8 S 5 4 20 13.3 99 13.5 13.3 13.3 15.0 15.2 15.4 15.5 14.6 13.2 1 3 3 0 2.9 000t00 1011.9 4.2 0.0 0.4
29 8 NE 1 6 10 9.7 97 11.3 9.2 9.2 13.0 13.2 14.0 14.5 14.5 13.5 1 2 3 0 0.1 000000 1020.4 0.4 0.0 0.7
30 8 E 3 7 20 9.2 96 12.3 9.0 9.0 11.4 12.0 13.0 14.3 14.3 13.5 1 0 3 0 0.0 000000 1020.4 0.0 0.0 0.5
31 8 00 0 5 02 10.9 91 14.2 9.2 9.2 13.3 12.7 13.0 14.0 14.0 13.5 1 0 1 0 0.0 000000 1023.5 0.0 0.0 0.7
------------------------------------------------------------------------------------------------------------------------
Mean
7 12.1 85 15.9 9.0 7.8 13.2 12.6 13.0 13.8 13.7 12.3 1015.0
Total 64.4 56.8 0.0 43.7
------------------------------------------------------------------------------------------------------------------------
(.) Difference from 1989-98 average used by the Climatological Observers Link. Rainfall was 110% of average,
Air temperatures Weather (No. days occurrence) 101% of the 1961-90 average.
Mean maximum 15.9 (-0.4) Sleet/snow falling 0 (-0.3) Most in a day: 11.9mm on 13th.
Mean minimum 9.0 (+1.5) Snow lying (at 09GMT) 0 (-0.1) No. of days with:
Mean 12.5 (+0.6) Hail <5 mm 0 [-1.1] >=0.2 mm 16 (+ 4.6)
No. days <0.0C 0 ( 0.0) Hail >=5 mm 0 [all hail] >=1.0 mm 12 (+ 3.5)
Mean grass min 7.8 (+2.0) Thunder heard 1 (+0.2) >=5.0 mm 5 (+ 1.3)
Lowest grass min 2.2 (+2.2) Gales 0 Lysimeter:
No. days <0.0C 0 (-0.9) Fog (at 09GMT) 0 PE 138.2 mm
PWB -73.8 mm
Highest maximum 22.8C on 27th. Lowest minimum 5.0C on 1st. PWS 7.8 mm
Minimum relative humidity: 55% on 4th. * Mean minimum 9.0C and highest min 13.3C PWD -81.5 mm
* warmest on record. Mean grass min 7.8C and lowest 2.2C also warmest on record. Piche: 43.7 ml
------------------------------------------------------------------------------------------------------------------------
Key: Observations at 09GMT...
DD date; N cloud (oktas, 9=obscured); dd wind direction (8 sectors, 00=calm); ff wind speed (Beaufort scale);
V visibility (0 dense fog, 1 thick fog, 2 fog, 3 moderate fog, 4 very poor, 5 poor, 6 moderate, 7 good, 8 very good);
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 05 haze, 10 mist,
20 drizzle in past hour, 42 fog thinning, 50 slight drizzle, 61 continuous slight rain, 62 intermittent moderate rain,
80 slight shower of rain, 81 moderate shower of rain.
Temperatures (degC); RH relative humidity (%); soil temperatures are under bare soil and earth under grass (degC);
SS snow depth (cm); Press air pressure, aneroid (mb). For state of the ground E, concrete C, and grass Gr codes consult
'Recording Atmospheric Depositions on Grass' page.
24 hour observations...
Max maximum temperature (degC) beginning 09GMT; Min minimum temperature ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning 09GMT;
Rain rainfall beginning 09GMT (mm); Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of frost (00-24GMT).
Monthly observations...
PE Potential evapotranspiration, PWB Potential water balance, PWS Potential water surplus, PWD Potential water deficit.
Weather: days with...
s slight or S heavy snow/sleet falling; L >=50% snow cover at 09GMT; H categories of hail: 3 snow pellets,
4 ice pellets, 5 hail 5-9 mm, 6 hail 10-19 mm; t slight or T heavy thunder heard; G gale; F fog at 09GMT.
------------------------------------------------------------------------------------------------------------------------
CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR JUNE 1999
------------------------------------------------------------------------------------------------------------------------
-09GMT--> -Air Temperature- --Soil temp-- --Earth temp-- -State Grd.- Weather Rain Fr. Pch
DD N dd ff V ww Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 100cm E C Gr SS Rain SLHTGF Press hrs hrs Evap
------------------------------------------------------------------------------------------------------------------------
01 7 00 0 5 01 14.2 87 17.3 10.1 8.3 15.4 13.7 13.1 14.2 14.1 13.5 1 0 1 0 13.3 000000 1022.7 4.0 0.0 0.9
02 8 NE 3 4 63 11.5 96 14.6 11.3 9.2 12.9 13.3 14.0 14.8 14.5 13.4 1 3 3 0 13.5 000000 1005.9 11.1 0.0 0.3
03 7 SW 2 5 10 11.5 96 15.9 10.5 9.6 13.3 13.2 13.5 14.4 14.3 13.5 1 2 3 0 6.5 000000 1003.8 3.8 0.0 0.9
04 7 SW 5 6 01 11.3 84 14.0 10.2 9.6 13.8 13.5 13.8 14.7 14.3 13.5 1 1 3 0 0.8 000000 1000.5 0.7 0.0 2.4
05 5 N 1 7 01 11.6 73 15.4 6.3 3.5 11.8 11.3 12.5 14.3 14.5 13.5 1 1 4 0 0.5 004000 1000.1 0.9 0.0 1.6
06 8 NW 1 6 61 10.7 95 13.2 6.1 3.5 13.0 12.7 13.2 14.8 14.5 13.5 1 3 3 0 2.6 000000 1003.8 1.0 0.0 0.7
07 5 N 3 7 01 10.5 80 13.0 8.4 6.5 13.3 12.4 12.9 14.5 14.4 13.7 1 0 1 0 0.0 000000 1010.3 0.0 0.0 1.2
08 6 NW 2 8 01 11.8 73 16.0 4.7 1.6 12.3 11.5 12.8 14.7 14.7 13.7 0 0 1 0 0.0 000000 1019.3 0.0 0.0 1.8
09 6 N 2 8 01 11.2 73 14.5 5.5 2.5 11.8 11.7 13.0 14.9 14.8 13.8 0 0 1 0 tr 000000 1025.7 0.0 0.0 1.2
10 7 N 2 7 01 12.1 81 15.0 9.8 8.1 14.4 13.5 13.5 15.0 14.8 13.8 0 0 1 0 0.0 000000 1028.3 0.0 0.0 1.0
11 7 NW 1 6 02 11.2 85 14.7 7.5 3.9 13.3 13.0 13.5 15.0 14.8 13.9 0 0 1 0 2.0 000000 1028.7 2.8 0.0 0.7
12 8 NW 1 5 21 11.1 96 15.5 9.6 9.1 13.6 13.2 13.5 14.9 14.8 13.9 1 2 3 0 0.0 000000 1023.9 0.0 0.0 1.0
13 7 SW 2 7 01 13.0 75 14.7 9.3 6.7 15.3 14.3 14.5 15.5 15.0 13.9 0 0 1 0 0.5 000000 1025.0 1.5 0.0 1.5
14 5 SW 4 7 80 14.1 88 18.2 12.0 11.4 15.2 14.5 14.5 15.4 15.1 13.9 0 0 3 0 0.0 000000 1025.4 0.0 0.0 1.9
15 7 S 3 7 01 15.5 89 19.0 12.0 10.4 16.8 15.7 15.2 16.0 15.4 14.1 0 0 1 0 0.0 000000 1028.0 0.0 0.0 2.0
16 2 S 3 8 02 17.1 63 19.5 13.1 12.5 16.7 15.6 16.0 16.3 15.7 14.3 0 0 0 0 0.8 000000 1025.4 2.1 0.0 2.6
17 7 N 2 7 01 13.0 83 15.6 11.5 10.8 17.2 16.2 16.2 16.8 15.9 14.3 1 0 3 0 0.0 000000 1025.7 0.0 0.0 1.8
18 1 S 3 8 02 15.6 73 19.5 7.7 5.3 13.0 14.0 15.5 16.8 16.3 14.6 0 0 1 0 tr 000000 1027.6 0.0 0.0 1.6
19 8 SW 4 5 20 15.5 89 18.7 13.6 13.4 17.3 17.2 17.4 17.3 16.5 14.8 0 0 3 0 21.1 000000 1022.3 9.8 0.0 1.3
20 7 NW 3 7 02 12.8 76 16.5 8.5 6.5 16.0 15.0 15.8 16.7 16.3 15.0 1 0 3 0 2.0 000000 1015.4 0.0 0.0 1.5
21 7 N 3 6 03 11.0 81 16.0 7.0 4.4 15.0 14.6 15.5 16.5 16.3 15.0 1 0 3 0 0.1 000000 1022.3 0.3 0.0 1.4
22 7 NW 3 7 02 13.5 72 16.0 7.8 4.9 16.4 15.0 15.6 16.6 16.3 15.1 1 0 1 0 9.8 000000 1023.9 8.2 0.0 1.2
23 7 S 1 7 01 14.1 88 17.7 10.5 10.0 16.5 15.3 15.5 16.3 16.1 15.0 1 1 3 0 0.2 000000 1022.0 0.8 0.0 0.9
24 6 00 0 6 03 16.6 84 19.7 10.3 7.3 17.7 15.5 15.5 16.4 16.0 15.0 1 0 1 0 0.0 000000 1027.2 0.0 0.0 1.5
25 5 S 2 7 05 19.2 67 23.0 12.8 9.5 18.7 17.0 16.8 17.2 16.3 15.0 1 0 1 0 0.0 000000 1023.5 0.0 0.0 2.8
26 3 S 2 7 05 19.5 54 24.5 12.2 9.2 20.3 17.5 17.3 17.9 16.9 15.0 1 0 1 0 17.8 000t00 1008.3 12.4 0.0 1.7
27 8 W 1 5 51 11.6 99 16.5 11.1 11.6 16.0 16.6 17.5 17.8 17.1 15.2 1 3 3 0 1.5 000000 999.3 3.5 0.0 1.2
28 7 SW 3 7 80 11.6 85 16.1 9.0 7.9 14.8 15.0 16.0 17.1 17.0 15.5 1 0 3 0 tr 000000 1004.2 0.0 0.0 2.0
29 5 SW 2 7 03 14.5 78 18.7 8.5 5.2 16.5 14.8 15.5 16.8 16.8 15.4 1 0 1 0 0.0 000000 1010.3 0.0 0.0 2.0
30 6 SW 3 7 01 14.2 77 17.1 11.0 9.5 16.6 15.8 16.4 17.0 16.8 15.4 0 0 1 0 8.3 000000 1018.5 7.3 0.0 2.0
------------------------------------------------------------------------------------------------------------------------
Mean
6 13.4 81 16.9 9.6 7.7 15.2 14.4 14.9 15.9 15.5 14.3 1017.6
Total 101.3 70.2 0.0 44.6
------------------------------------------------------------------------------------------------------------------------
(.) Difference from 1989-98 average used by the Climatological Observers Link. Rainfall was 135% of average:
Air temperatures Weather (No. days occurrence) 149% of 1961-90 average.
Mean maximum 16.9 (-0.7) Sleet/snow falling 0 ( 0.0) Most in a day: 21.1 mm on 19th.
Mean minimum 9.6 ( 0.0) Snow lying (at 09GMT) 0 ( 0.0) No. of days with:
Mean 13.2 (-0.4) Hail <5 mm 1 [+0.8] >=0.2 mm 16 (+ 0.8)
No. days <0.0C 0 ( 0.0) Hail >=5 mm 0 [all hail] >=1.0 mm 11 (+ 0.4)
Mean grass min 7.7 (-0.4) Thunder heard 1 (+0.1) >=5.0 mm 7 (+ 1.6)
Lowest grass min 1.6 (-1.4) Gales 0 Lysimeter:
No. days <0.0C 0 ( 0.0) Fog (at 09GMT) 0 PE 130.6 mm
PWB -29.3 mm
Highest maximum 24.5C on 26th. Lowest minimum 4.7 on 8th. PWS 48.3 mm
Minimum relative humidity: 48% on 8th. PWD -77.6 mm
* Third consecutive wet June >100mm. Third wettest first 6 months of year 599.0 mm. Piche: 44.6 ml
------------------------------------------------------------------------------------------------------------------------
Key: Observations at 09GMT...
DD date; N cloud (oktas, 9=obscured); dd wind direction (8 sectors, 00=calm); ff wind speed (Beaufort scale);
V visibility (0 dense fog, 1 thick fog, 2 fog, 3 moderate fog, 4 very poor, 5 poor, 6 moderate, 7 good, 8 very good);
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 05 haze, 10 mist, 20 drizzle
in past hour, 21 rain in past hr, 51 continuous slight drizzle, 61 cont. sl. rain, 63 cont. moderate rain,
80 slight rain shower.
Temperatures (degC); RH relative humidity (%); soil temperatures are under bare soil and earth under grass (degC);
SS snow depth (cm); Press air pressure, aneroid (mb). For state of the ground E, concrete C, and grass Gr codes consult
'Recording Atmospheric Depositions on Grass' page.
24 hour observations...
Max maximum temperature (degC) beginning 09GMT; Min minimum temperature ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning 09GMT;
Rain rainfall beginning 09GMT (mm); Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of frost (00-24GMT).
Monthly observations...
PE Potential evapotranspiration, PWB Potential water balance, PWS Potential water surplus, PWD Potential water deficit.
Weather: days with...
s slight or S heavy snow/sleet falling; L >=50% snow cover at 09GMT; H categories of hail: 3 snow pellets,
4 ice pellets, 5 hail 5-9 mm, 6 hail 10-19 mm; t slight or T heavy thunder heard; G gale; F fog at 09GMT.
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CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR JULY 1999
------------------------------------------------------------------------------------------------------------------------
-09GMT--> -Air Temperature- --Soil temp-- --Earth temp-- -State Grd.- Weather Rain Fr. Pch
DD N dd ff V ww Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 100cm E C Gr SS Rain SLHTGF Press hrs hrs Evap
------------------------------------------------------------------------------------------------------------------------
01 8 SW 2 4 20 14.0 98 17.7 11.3 10.5 16.0 16.0 16.2 16.9 16.7 15.5 1 2 3 0 2.4 000000 1013.1 5.5 0.0 0.4
02 8 S 4 5 20 15.7 98 23.4 13.7 13.7 16.7 16.5 16.7 17.1 16.8 15.4 1 1 3 0 0.7 000t00 1014.2 0.2 0.0 1.2
03 8 SW 4 7 03 15.5 89 18.5 13.5 13.2 17.8 17.5 17.5 17.8 17.0 15.5 1 1 3 0 tr 000000 1007.1 0.0 0.0 1.6
04 6 SW 3 5 10 16.4 82 21.0 13.7 11.8 17.9 16.8 17.0 17.5 16.9 15.6 1 0 1 0 0.0 000000 1007.5 0.0 0.0 1.6
05 7 S 1 7 03 18.5 79 20.5 13.0 9.9 19.5 18.0 17.5 17.8 17.1 15.8 1 0 1 0 8.0 000000 1010.3 2.0 0.0 0.9
06 5 S 3 7 02 17.5 84 22.1 11.9 8.6 19.0 17.0 17.1 17.9 17.2 15.9 1 0 1 0 0.0 000000 1016.2 0.0 0.0 1.2
07 7 SW 1 8 01 17.3 80 20.3 14.1 12.8 19.0 18.0 18.1 18.4 17.5 16.0 1 0 1 0 0.0 000000 1024.2 0.0 0.0 2.0
08 1 S 1 7 01 20.3 79 24.3 14.5 12.6 20.3 18.0 18.0 18.5 17.5 16.0 0 0 1 0 0.0 000000 1033.1 0.0 0.0 1.8
09 1 00 0 6 05 22.7 77 27.0 14.2 12.8 21.8 19.2 19.0 19.3 18.2 16.2 0 0 1 0 0.0 000000 1032.0 0.0 0.0 1.4
10 7 NE 1 5 05 21.0 85 23.2 17.5 16.9 22.2 21.0 21.5 20.1 18.8 16.5 0 0 1 0 0.0 000000 1029.4 0.0 0.0 1.1
11 0 NE 3 7 02 18.3 73 21.5 14.5 14.1 21.5 20.0 20.0 20.2 19.0 16.9 0 0 1 0 0.0 000000 1029.1 0.0 0.0 2.3
12 0 NE 2 7 04 18.4 75 22.4 14.2 11.6 20.7 19.3 20.0 20.2 19.3 17.0 0 0 1 0 0.0 000000 1025.0 0.0 0.0 2.1
13 8 SW 2 7 03 15.5 74 16.4 10.5 8.1 19.1 19.0 19.8 20.0 19.3 17.2 0 0 1 0 1.1 000000 1013.5 1.0 0.0 1.3
14 8 SW 3 7 50 13.2 80 17.5 11.5 8.8 17.0 17.2 18.0 19.0 18.9 17.3 0 0 3 0 0.7 000000 1011.5 0.4 0.0 2.1
15 7 W 4 7 01 14.4 74 17.4 10.1 6.9 17.2 16.8 17.5 18.4 18.4 17.2 0 0 1 0 0.2 000000 1014.6 0.2 0.0 2.2
16 7 SW 5 6 01 15.7 84 19.4 13.6 12.7 17.1 17.2 17.7 18.1 18.2 17.1 0 0 3 0 tr 000000 1017.4 0.0 0.0 2.6
17 7 SW 6 7 50 15.8 76 18.7 13.1 12.3 17.1 17.1 17.6 17.9 18.0 17.0 0 0 0 0 2.4 000000 1017.4 4.5 0.0 1.4
18 8 SW 2 5 50 15.4 98 18.2 14.9 14.6 16.8 17.0 17.5 17.7 17.7 16.9 1 3 3 0 0.1 000000 1015.4 0.0 0.0 1.4
19 8 SW 4 7 02 17.7 88 18.8 15.0 13.8 18.0 17.0 17.1 17.7 17.7 16.8 0 0 3 0 9.5 000000 1009.1 4.7 0.0 0.8
20 6 SW 4 7 01 15.9 90 18.4 14.5 14.5 17.5 17.0 17.2 17.7 17.5 16.6 1 2 3 0 tr 000000 1004.2 0.0 0.0 2.2
21 8 W 5 7 80 12.8 85 16.5 11.4 10.1 15.4 15.6 16.5 17.3 17.3 16.4 1 0 3 0 1.0 000000 1012.7 1.8 0.0 2.1
22 8 N 3 7 02 11.7 87 16.6 10.7 10.5 15.0 15.4 16.2 17.1 17.2 16.5 1 1 3 0 0.0 000000 1024.2 0.0 0.0 1.5
23 7 SW 3 8 01 15.7 77 19.1 8.6 5.9 15.5 14.8 15.8 16.9 17.1 16.3 1 0 1 0 0.0 000000 1027.6 0.0 0.0 2.0
24 2 S 4 6 05 19.1 83 22.3 14.0 11.5 18.8 17.6 17.6 17.0 17.3 16.3 0 0 1 0 0.0 000000 1025.4 0.0 0.0 1.6
25 7 NE 1 6 05 13.8 78 17.2 11.6 11.6 18.0 17.6 18.0 18.0 17.5 16.3 0 0 1 0 0.0 000000 1026.1 0.0 0.0 1.9
26 0 NE 3 8 01 16.8 68 20.0 11.5 8.8 18.0 16.8 17.5 18.2 17.5 16.5 0 0 1 0 0.0 000000 1028.3 0.0 0.0 2.7
27 1 E 2 7 02 15.1 72 20.7 10.3 7.2 17.3 16.5 17.7 18.1 17.8 16.5 0 0 1 0 0.0 000000 1028.3 0.0 0.0 2.3
28 5 NE 1 7 02 16.1 70 23.3 8.8 6.8 18.2 17.3 18.0 18.3 17.8 16.5 0 0 1 0 0.0 000000 1026.5 0.0 0.0 2.6
29 5 S 1 7 05 18.8 68 24.3 10.8 7.6 18.5 17.6 18.5 18.6 18.0 16.7 0 0 1 0 0.0 000000 1024.2 0.0 0.0 2.1
30 0 00 0 7 05 22.5 63 26.5 13.3 11.4 20.4 19.0 19.2 19.0 18.5 16.9 0 0 1 0 0.0 000000 1019.7 0.0 0.0 2.6
31 5 NE 1 7 05 21.7 79 27.5 14.6 12.3 20.6 17.6 20.0 19.8 18.8 17.0 0 0 1 0 0.0 000000 1017.4 0.0 0.0 1.9
------------------------------------------------------------------------------------------------------------------------
Mean
5 16.9 80 20.7 12.7 11.1 18.3 17.5 17.9 18.3 17.8 16.5 1019.5
Total 26.1 20.3 0.0 54.9
------------------------------------------------------------------------------------------------------------------------
(.) Difference from 1989-98 average used by the Climatological Observers Link. Rainfall was 47% of average;
Air temperatures Weather (No. days occurrence) 36% of 1961-90 average.
Mean maximum 20.7 (+0.8) Sleet/snow falling 0 ( 0.0) Most in a day: 9.5 mm on 19th.
Mean minimum 12.7 (+0.7) Snow lying (at 09GMT) 0 ( 0.0) No. of days with:
Mean 16.7 (+0.8) Hail <5 mm 0 [-0.1] >=0.2 mm 9 (- 5.1)
No. days <0.0C 0 ( 0.0) Hail >=5 mm 0 [all hail] >=1.0 mm 6 (- 3.6)
Mean grass min 11.1 (+5.6) Thunder heard 1 (+0.4) >=5.0 mm 2 (- 1.8)
Lowest grass min 5.9 (+0.4) Gales 0 Lysimeter:
No. days <0.0C 0 ( 0.0) Fog (at 09GMT) 0 PE 112.9 mm
PWB -86.8 mm
Highest maximum 27.5C on 31st. Lowest minimum 8.6 on 23rd. PWS 3.0 mm
Minimum relative humidity: 50% on 30th PWD -89.8 mm
* Grass min 16.9C on 10th highest in records any month. Mean soil 30cm of 18.3C Piche: 54.9 ml
second highest to 1995 (18.5C). Driest since 1984 (19.2 mm) and sixth driest July in records since 1928.
------------------------------------------------------------------------------------------------------------------------
Key: Observations at 09GMT...
DD date; N cloud (oktas, 9=obscured); dd wind direction (8 sectors, 00=calm); ff wind speed (Beaufort scale);
V visibility (0 dense fog, 1 thick fog, 2 fog, 3 moderate fog, 4 very poor, 5 poor, 6 moderate, 7 good, 8 very good);
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 04 smoke haze, 05 haze,
10 mist, 20 rain in past hour, 50 slight drizzle, slight rain shower.
Temperatures (degC); RH relative humidity (%); soil temperatures are under bare soil and earth under grass (degC);
SS snow depth (cm); Press air pressure, aneroid (mb). For state of the ground E, concrete C, and grass Gr codes consult
'Recording Atmospheric Depositions on Grass' page.
24 hour observations...
Max maximum temperature (degC) beginning 09GMT; Min minimum temperature ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning 09GMT;
Rain rainfall beginning 09GMT (mm); Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of frost (00-24GMT).
Monthly observations...
PE Potential evapotranspiration, PWB Potential water balance, PWS Potential water surplus, PWD Potential water deficit.
Weather: days with...
s slight or S heavy snow/sleet falling; L >=50% snow cover at 09GMT; H categories of hail: 3 snow pellets,
4 ice pellets, 5 hail 5-9 mm, 6 hail 10-19 mm; t slight or T heavy thunder heard; G gale; F fog at 09GMT.
------------------------------------------------------------------------------------------------------------------------
CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR AUGUST 1999
------------------------------------------------------------------------------------------------------------------------
-09GMT--> -Air Temperature- --Soil temp-- --Earth temp-- -State Grd.- Weather Rain Fr. Pch
DD N dd ff V ww Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 100cm E C Gr SS Rain SLHTGF Press hrs hrs Evap
------------------------------------------------------------------------------------------------------------------------
01 8 NE 1 4 10 16.5 92 21.6 13.0 11.2 20.0 19.6 19.9 19.8 19.0 17.1 0 0 1 0 0.0 000000 1017.4 0.0 0.0 1.1
02 7 S 1 6 02 20.5 75 23.1 14.6 14.0 21.0 20.0 20.0 19.8 19.1 17.2 0 0 1 0 8.4 000t00 1015.4 8.6 0.0 1.0
03 8 00 0 4 10 16.9 99 18.5 16.0 15.8 19.0 19.1 19.5 19.7 19.0 17.5 1 3 3 0 6.0 000000 1012.3 5.9 0.0 0.5
04 7 SE 1 7 03 18.5 92 25.1 13.1 11.6 19.1 18.0 18.3 19.1 18.8 17.2 1 0 2 0 13.5 000t00 1012.3 8.1 0.0 1.1
05 8 00 0 5 61 15.7 99 21.2 15.3 15.0 17.6 18.5 19.1 19.5 18.9 17.5 1 3 3 0 6.2 000000 1009.5 1.2 0.0 1.4
06 7 SE 1 8 02 19.3 79 23.3 13.1 10.6 19.0 18.0 18.7 19.1 18.8 17.5 1 0 1 0 16.4 000000 1011.9 11.8 0.0 0.5
07 8 E 2 5 10 15.7 98 19.0 15.1 14.9 18.0 18.2 19.0 19.3 18.9 17.5 1 2 3 0 2.4 000000 1007.5 1.7 0.0 1.1
08 8 E 4 7 61 13.5 98 16.0 13.3 12.8 16.2 17.0 18.0 18.5 18.6 17.5 1 3 3 0 tr 000000 1004.2 0.0 0.0 1.0
09 8 NE 3 6 02 15.0 91 15.4 13.3 12.8 16.6 16.8 17.3 18.2 18.3 17.5 1 0 1 0 3.0 000000 1004.6 8.0 0.0 0.4
10 7 NE 1 7 03 13.7 87 17.0 11.3 11.3 16.5 16.0 16.6 17.5 17.8 17.2 1 2 3 0 0.0 000000 1015.8 0.0 0.0 1.3
11 5 S 2 7 03 16.2 76 18.0 9.2 6.2 15.2 15.2 16.5 17.6 17.8 17.2 1 0 1 0 tr 000000 1021.2 0.0 0.0 1.0
12 6 SE 1 6 02 17.0 84 18.7 11.0 7.9 17.1 16.3 16.9 17.7 17.8 17.2 1 0 1 0 3.9 000000 1022.0 4.0 0.0 1.0
13 8 SW 5 6 02 16.2 96 17.5 14.2 11.6 17.0 16.8 17.1 17.6 17.6 16.9 1 2 3 0 4.7 000000 1012.7 4.5 0.0 0.6
14 7 SW 4 7 01 14.5 85 17.5 11.0 8.5 16.2 16.0 16.7 17.3 17.5 16.9 1 1 3 0 0.4 000000 1003.4 1.2 0.0 1.2
15 4 NW 2 7 02 14.4 78 18.2 10.8 8.8 15.1 15.0 16.1 17.2 17.5 16.9 1 0 1 0 0.0 000000 1008.3 0.0 0.0 1.8
16 6 W 3 7 03 13.7 79 17.5 8.0 4.7 15.1 14.8 15.8 16.8 17.2 16.8 1 0 1 0 2.1 000000 1008.7 2.3 0.0 1.6
17 8 SW 1 7 61 12.2 96 19.0 10.7 8.3 14.6 15.0 15.9 16.8 17.1 16.5 1 3 3 0 0.4 000000 1000.5 1.1 0.0 2.0
18 6 NE 2 7 03 14.4 90 18.0 9.8 6.6 14.9 14.8 15.8 16.7 17.0 16.7 1 0 1 0 2.8 000000 995.9 2.7 0.0 1.1
19 5 N 3 7 03 13.7 81 17.2 8.1 4.7 14.5 14.8 16.0 17.0 17.0 16.4 1 0 1 0 0.0 000000 1011.5 0.0 0.0 1.3
20 7 NE 2 7 03 14.5 83 18.6 9.0 6.7 15.8 15.2 16.0 16.8 17.0 16.5 1 0 1 0 0.0 000000 1023.5 0.0 0.0 1.9
21 1 NE 1 7 05 14.4 74 17.5 7.6 5.1 14.8 14.5 16.0 16.9 17.0 16.5 0 0 1 0 0.0 000000 1027.6 0.0 0.0 1.9
22 1 SE 2 7 05 15.1 71 21.7 9.2 6.0 15.0 15.0 16.2 17.0 17.1 16.5 0 0 1 0 0.0 000000 1025.0 0.0 0.0 2.2
23 8 NE 1 7 03 14.8 80 17.3 12.3 10.3 17.0 17.0 17.4 17.5 17.3 16.4 0 0 1 0 1.0 000000 1020.4 2.5 0.0 1.5
24 8 E 3 6 02 16.4 78 19.8 13.5 11.7 16.6 16.3 16.9 17.2 17.2 16.5 1 0 3 0 2.6 000000 1018.9 6.1 0.0 1.2
25 8 00 0 5 61 16.5 98 20.2 14.5 13.9 17.0 16.9 17.1 17.3 17.2 16.5 1 3 3 0 6.0 000000 1012.3 2.8 0.0 0.8
26 7 SW 3 5 10 15.5 95 17.5 14.3 13.0 16.5 16.6 17.0 17.4 17.2 16.4 1 0 3 0 tr 000000 1009.1 0.0 0.0 1.0
27 6 SW 3 5 10 15.0 85 20.1 10.9 7.3 15.3 15.3 16.2 17.1 17.3 16.3 1 0 1 0 0.0 000000 1019.3 0.0 0.0 1.8
28 1 W 1 7 01 16.0 71 19.0 13.4 11.0 17.5 17.0 17.2 17.7 17.3 16.4 0 0 1 0 0.0 000000 1025.7 0.0 0.0 1.4
29 8 SW 4 7 03 16.4 83 18.3 11.2 8.6 16.1 15.8 15.7 17.3 17.4 16.5 0 0 1 0 4.2 000000 1021.6 2.5 0.0 0.6
30 7 W 3 7 01 13.7 89 15.6 9.8 7.5 14.8 14.6 15.6 16.7 17.1 16.5 1 0 1 0 0.0 000000 1022.0 0.0 0.0 1.0
31 8 W 2 5 02 15.6 87 17.8 12.1 10.0 16.0 15.5 16.0 16.5 16.8 16.3 1 0 1 0 0.0 000000 1022.0 0.0 0.0 1.1
------------------------------------------------------------------------------------------------------------------------
Mean
6 15.5 86 18.9 11.9 9.9 16.6 16.4 17.1 17.8 17.7 16.9 1014.3
Total 84.0 75.0 0.0 37.4
------------------------------------------------------------------------------------------------------------------------
(.) Difference from 1989-98 average used by the Climatological Observers Link. Rainfall was 118% of average
Air temperatures Weather (No. days occurrence) but 94% of 1961-90 average.
Mean maximum 18.9 (-0.3) Sleet/snow falling 0 ( 0.0) Most in a day: 16.4 mm on 6th.
Mean minimum 11.9 (+0.3) Snow lying (at 09GMT) 0 ( 0.0) No. of days with:
Mean 15.4 ( 0.0) Hail <5 mm 0 [ 0.0] >=0.2 mm 17 (+ 2.8)
No. days <0.0C 0 ( 0.0) Hail >=5 mm 0 [all hail] >=1.0 mm 15 (+ 4.7)
Mean grass min 9.9 (-0.5) Thunder heard 2 (+1.3) >=5.0 mm 6 (+ 1.0)
Lowest grass min 4.7 (-1.0) Gales 0 Lysimeter:
No. days <0.0C 0 ( 0.0) Fog (at 09GMT) 0 PE 66.1 mm
PWB 17.9 mm
Highest maximum 25.1C on 4th. Lowest minimum 7.6 on 21st. PWS 39.1 mm
Minimum relative humidity: 50% on 22nd. PWD -21.1 mm
* Wettest August since 1992 (149 mm). Piche: 37.4 ml
------------------------------------------------------------------------------------------------------------------------
Key: Observations at 09GMT...
DD date; N cloud (oktas, 9=obscured); dd wind direction (8 sectors, 00=calm); ff wind speed (Beaufort scale);
V visibility (0 dense fog, 1 thick fog, 2 fog, 3 moderate fog, 4 very poor, 5 poor, 6 moderate, 7 good, 8 very good);
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 04 smoke haze, 05 haze,
61 continuous slight rain.
Temperatures (degC); RH relative humidity (%); soil temperatures are under bare soil and earth under grass (degC);
SS snow depth (cm); Press air pressure, aneroid (mb). For state of the ground E, concrete C, and grass Gr codes consult
'Recording Atmospheric Depositions on Grass' page.
24 hour observations...
Max maximum temperature (degC) beginning 09GMT; Min minimum temperature ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning 09GMT;
Rain rainfall beginning 09GMT (mm); Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of frost (00-24GMT).
Monthly observations...
PE Potential evapotranspiration, PWB Potential water balance, PWS Potential water surplus, PWD Potential water deficit.
Weather: days with...
s slight or S heavy snow/sleet falling; L >=50% snow cover at 09GMT; H categories of hail: 3 snow pellets,
4 ice pellets, 5 hail 5-9 mm, 6 hail 10-19 mm; t slight or T heavy thunder heard; G gale; F fog at 09GMT.
------------------------------------------------------------------------------------------------------------------------
CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR SEPTEMBER 1999
------------------------------------------------------------------------------------------------------------------------
-09GMT--> -Air Temperature- --Soil temp-- --Earth temp-- -State Grd.- Weather Rain Fr. Pch
DD N dd ff V ww Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 100cm E C Gr SS Rain SLHTGF Press hrs hrs Evap
------------------------------------------------------------------------------------------------------------------------
01 8 SW 3 7 02 17.2 84 20.8 12.6 10.0 16.2 15.7 16.0 16.7 16.7 16.2 1 0 1 0 0.0 000000 1023.1 0.0 0.0 1.6
02 5 SW 3 7 01 19.3 83 21.4 15.4 14.2 18.0 17.0 17.0 17.2 16.8 16.2 0 0 1 0 0.0 000000 1023.9 0.0 0.0 1.3
03 6 SW 3 7 01 17.3 94 22.5 13.7 11.0 16.8 16.6 17.2 17.4 17.2 16.3 0 0 1 0 0.0 000000 1022.0 0.0 0.0 1.2
04 0 00 0 7 05 18.7 81 22.4 13.1 10.5 17.2 16.6 17.4 17.7 17.3 16.4 0 0 1 0 0.0 000000 1023.5 0.0 0.0 1.8
05 6 00 0 5 10 19.6 85 26.3 14.0 11.7 19.1 17.8 18.1 18.2 17.6 16.5 0 0 1 0 0.0 000000 1018.5 0.0 0.0 2.0
06 6 S 3 5 10 18.2 83 19.6 13.2 10.2 18.5 17.8 18.2 18.4 17.9 16.8 0 0 1 0 33.8 000000 1012.3 8.8 0.0 1.4
07 7 W 3 6 10 14.0 95 18.9 12.1 11.8 16.6 16.9 17.5 17.8 17.8 16.8 1 2 3 0 0.0 000000 1009.5 0.0 0.0 2.7
08 7 S 7 6 10 16.1 75 19.7 12.5 9.9 15.0 15.6 16.7 17.7 17.7 16.9 1 0 0 0 12.6 0000G0 1011.5 2.6 0.0 1.6
09 1 W 2 7 01 13.5 72 17.7 8.5 4.6 13.1 13.5 15.4 16.8 17.4 16.8 1 0 1 0 0.0 000000 1025.0 0.0 0.0 2.9
10 6 S 2 7 03 16.5 60 22.0 9.3 5.5 14.0 13.5 15.0 16.5 17.0 16.8 1 0 1 0 0.1 000000 1026.5 0.0 0.0 3.4
11 7 SW 5 5 10 18.7 84 18.9 15.6 12.2 17.3 17.0 17.0 17.2 17.2 16.5 1 0 0 0 2.6 000000 1014.2 3.9 0.0 0.8
12 5 S 2 8 02 11.9 78 17.1 8.4 4.2 13.7 13.8 15.2 16.4 16.9 16.5 1 0 1 0 3.7 000000 1016.2 2.0 0.0 2.1
13 6 SW 4 8 01 11.6 82 16.3 10.1 5.5 12.8 13.8 15.1 16.2 16.5 16.4 1 1 3 0 0.6 000000 1011.1 1.2 0.0 1.8
14 1 S 1 7 01 12.5 88 18.5 8.5 6.0 13.1 13.5 14.8 16.0 16.6 16.3 1 2 3 0 tr 000000 1016.2 0.0 0.0 1.9
15 1 S 1 8 02 13.3 66 18.9 6.8 4.3 11.9 12.4 14.4 15.7 16.2 16.2 1 0 1 0 0.6 000000 1011.1 1.8 0.0 2.6
16 8 S 4 5 61 12.7 100 17.0 12.5 11.9 14.5 15.5 16.0 16.5 16.5 16.5 1 3 3 0 5.1 000000 1003.8 2.1 0.0 2.0
17 6 SW 3 7 25 14.3 98 17.0 10.5 9.4 14.3 13.9 15.0 15.8 16.2 16.2 1 2 3 0 1.0 000t00 1002.2 0.2 0.0 2.8
18 7 S 4 7 01 15.5 64 18.5 10.5 8.0 13.5 14.0 14.5 15.5 16.0 16.0 1 0 0 0 10.4 000000 992.9 7.3 0.0 3.1
19 8 SE 1 6 61 13.5 94 15.5 13.5 12.7 13.5 14.0 14.5 15.5 16.0 16.0 2 3 3 0 25.4 000000 991.8 11.6 0.0 0.3
20 8 E 3 5 63 15.0 98 16.5 13.0 9.4 15.0 15.0 15.0 15.5 16.0 16.0 2 3 3 0 12.3 000000 986.3 4.2 0.0 0.9
21 6 S 4 7 01 15.5 79 19.0 13.0 11.2 15.0 14.5 15.0 16.0 16.0 16.0 1 0 3 0 0.1 000000 991.5 0.0 0.0 1.6
22 6 SE 1 7 01 15.0 89 18.6 10.0 6.7 14.5 14.5 15.0 16.0 16.0 16.0 1 0 1 0 5.4 000t00 995.5 2.1 0.0 2.0
23 5 S 3 5 25 16.0 79 17.5 13.5 11.1 14.0 14.5 15.0 16.0 16.0 16.0 1 2 3 0 1.5 000000 997.1 1.9 0.0 1.4
24 3 SW 5 6 25 14.5 94 17.0 14.0 12.0 14.5 14.5 15.0 16.0 16.0 16.0 1 2 3 0 5.0 000000 1002.7 1.8 0.0 1.0
25 8 E 2 6 80 13.5 98 16.0 12.0 7.2 14.5 14.5 15.0 15.5 16.0 16.0 1 3 3 0 12.6 000t00 1003.9 6.5 0.0 0.3
26 7 W 2 6 01 12.5 94 16.5 11.0 10.3 14.5 14.5 15.0 15.5 16.0 16.0 1 2 3 0 5.5 000000 1000.1 3.4 0.0 0.8
27 8 SW 3 6 60 12.5 93 16.0 11.0 9.5 14.0 14.0 15.0 15.5 16.0 16.0 1 2 3 0 3.4 000000 992.0 1.5 0.0 0.4
28 4 SW 3 5 03 12.5 94 15.0 9.5 6.1 12.0 13.0 13.0 15.0 16.0 16.0 1 1 1 0 7.8 000000 998.0 2.3 0.0 1.4
29 8 SW 4 5 95 12.0 94 14.5 11.5 11.4 13.5 14.0 14.5 15.0 15.5 15.5 2 3 3 0 20.9 000T00 991.6 4.0 0.0 0.4
30 8 W 4 5 53 12.5 100 13.5 10.0 7.8 13.0 13.0 13.5 14.5 15.0 15.5 2 3 3 0 3.9 000000 994.8 4.1 0.0 1.2
------------------------------------------------------------------------------------------------------------------------
Mean
6 14.9 86 18.3 11.6 9.2 14.8 14.8 15.5 16.3 16.5 16.2 1007.0
Total 174.3 73.3 0.0 48.7
------------------------------------------------------------------------------------------------------------------------
(.) Difference from 1989-98 average used by the Climatological Observers Link. Rainfall was 231% of average
Air temperatures Weather (No. days occurrence) but 189% of 1961-90 average.
Mean maximum 18.3 (+1.1) Sleet/snow falling 0 ( 0.0) Most in a day: 33.8 mm on 6th.
Mean minimum 11.6 (+1.7) Snow lying (at 09GMT) 0 ( 0.0) No. of days with:
Mean 15.0 (+1.4) Hail <5 mm 0 [-0.5] >=0.2 mm 20 (+ 6.3)
No. days <0.0C 0 ( 0.0) Hail >=5 mm 0 [all hail] >=1.0 mm 18 (+ 6.9)
Mean grass min 8.9 (+1.0) Thunder heard 4 (+3.5) >=5.0 mm 12 (+ 6.9)
Lowest grass min 4.2 (+1.3) Gales 1 Lysimeter:
No. days <0.0C 0 ( 0.0) Fog (at 09GMT) 0 PE 43.4 mm
PWB 130.9 mm
Highest maximum 26.3C on 5th. Lowest minimum 6.8 on 15th. PWS 143.2 mm
Minimum relative humidity: 48% on 15th PWD -12.2 mm
* Warmest Sep on record since 1979. Wettest since 1976 & 7th wettest since 1928. Piche: 48.7 ml
------------------------------------------------------------------------------------------------------------------------
Key: Observations at 09GMT...
DD date; N cloud (oktas, 9=obscured); dd wind direction (8 sectors, 00=calm); ff wind speed (Beaufort scale);
V visibility (0 dense fog, 1 thick fog, 2 fog, 3 moderate fog, 4 very poor, 5 poor, 6 moderate, 7 good, 8 very good);
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 05 haze, 25 shower in past hour
53 continuous moderate drizzle, 60 intermittent slight rain, 61 continuous slight rain, 63 cont. mod. rain,
80 slight rain shower, 95 thunderstorm.
Temperatures (degC); RH relative humidity (%); soil temperatures are under bare soil and earth under grass (degC);
SS snow depth (cm); Press air pressure, aneroid (mb). For state of the ground E, concrete C, and grass Gr codes consult
'Recording Atmospheric Depositions on Grass' page.
24 hour observations...
Max maximum temperature (degC) beginning 09GMT; Min minimum temperature ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning 09GMT;
Rain rainfall beginning 09GMT (mm); Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of frost (00-24GMT).
Monthly observations...
PE Potential evapotranspiration, PWB Potential water balance, PWS Potential water surplus, PWD Potential water deficit.
Weather: days with...
s slight or S heavy snow/sleet falling; L >=50% snow cover at 09GMT; H categories of hail: 3 snow pellets,
4 ice pellets, 5 hail 5-9 mm, 6 hail 10-19 mm; t slight or T heavy thunder heard; G gale; F fog at 09GMT.
------------------------------------------------------------------------------------------------------------------------
CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR OCTOBER 1999
------------------------------------------------------------------------------------------------------------------------
-09GMT--> -Air Temperature- --Soil temp-- --Earth temp-- -State Grd.- Weather Rain Fr. Pch
DD N dd ff V ww Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 100cm E C Gr SS Rain SLHTGF Press hrs hrs Evap
------------------------------------------------------------------------------------------------------------------------
01 8 SW 6 5 25 11.0 86 12.5 9.5 8.4 10.5 12.0 13.0 14.0 15.0 15.0 2 3 3 0 21.5 0000G0 995.9 13.2 0.0 1.0
02 4 W 6 7 02 9.5 76 12.5 6.0 3.8 9.5 10.5 12.0 13.5 15.0 15.0 2 1 3 0 6.0 000000 989.8 5.9 0.0 1.2
03 8 NW 3 6 62 10.0 93 13.5 7.5 4.9 10.0 10.5 11.0 13.0 14.0 15.0 1 3 3 0 0.9 004000 1000.1 1.0 0.0 0.9
04 2 N 4 6 01 9.8 73 12.5 7.0 4.1 9.8 10.4 11.7 13.1 14.0 14.8 1 1 3 0 0.1 000000 1015.8 0.0 0.0 1.1
05 5 SE 1 8 03 8.6 85 14.5 5.6 2.2 9.7 10.2 11.5 12.8 13.8 14.3 1 0 1 0 0.0 000000 1026.1 0.0 0.0 1.2
06 6 S 1 8 02 9.7 72 13.8 4.7 2.0 8.0 9.2 11.0 12.4 13.5 14.2 1 0 1 0 7.8 000000 1028.7 4.0 0.0 1.8
07 8 NW 1 7 02 11.7 98 14.2 9.6 7.8 12.0 12.1 12.1 12.6 13.2 14.2 1 2 3 0 5.6 000000 1024.2 4.2 0.0 0.5
08 8 SW 2 6 02 14.2 93 14.6 11.6 11.4 14.5 13.0 13.0 13.2 13.4 14.0 1 2 3 0 1.5 000000 1022.0 5.1 0.0 0.5
09 8 SW 3 5 02 13.5 95 15.0 12.7 12.2 13.5 13.5 13.5 13.5 13.6 13.8 1 2 3 0 1.2 000000 1022.0 2.6 0.0 0.2
10 8 S 3 6 20 14.0 99 15.5 13.4 13.0 14.2 14.2 14.0 13.8 13.8 13.9 1 2 3 0 1.2 000000 1021.2 0.2 0.0 0.7
11 1 W 2 7 01 8.7 89 14.5 5.0 1.8 8.5 10.0 12.0 13.2 13.8 13.9 1 0 1 0 0.0 000000 1028.0 0.0 0.0 1.3
12 3 S 1 7 05 9.4 88 15.0 6.2 2.6 8.3 9.6 11.2 12.6 13.5 13.9 1 0 1 0 0.0 000000 1032.3 0.0 0.0 1.0
13 1 SW 1 7 01 10.0 82 15.5 6.4 3.4 8.2 9.3 11.0 12.2 13.0 13.8 1 0 1 0 0.0 000000 1032.7 0.0 0.0 1.1
14 1 NE 1 7 01 10.5 94 15.9 7.3 4.3 9.4 10.0 11.0 12.0 12.9 13.8 1 0 1 0 0.0 000000 1030.9 0.0 0.0 1.2
15 5 SE 2 7 05 11.8 81 17.8 8.2 4.0 9.3 10.0 11.1 12.1 12.8 13.7 1 0 1 0 0.0 000000 1022.7 0.0 0.0 1.2
16 8 00 0 7 05 12.0 90 17.0 9.4 6.6 11.5 11.5 12.0 12.3 12.9 13.4 1 0 1 0 0.0 000000 1023.9 0.0 0.0 0.7
17 1 E 1 6 05 10.8 82 15.5 8.6 5.5 10.2 11.3 12.3 12.7 13.0 13.5 1 0 1 0 0.0 000000 1021.6 0.0 0.0 1.5
18 1 E 3 7 05 8.0 75 13.5 7.0 3.5 7.9 9.5 11.2 11.2 13.0 13.4 1 0 1 0 0.0 000000 1021.6 0.0 0.0 1.7
19 3 E 5 7 05 7.3 77 12.7 4.6 0.2 6.5 8.2 10.1 11.5 12.6 13.3 1 0 1 0 0.0 000000 1017.8 0.0 0.0 1.5
20 3 SE 4 5 04 7.0 78 10.9 5.7 2.5 7.0 8.0 9.7 11.0 12.2 13.2 1 0 1 0 0.0 000000 1010.3 0.0 0.0 1.5
21 8 E 2 5 02 8.9 82 12.0 6.9 5.7 8.7 9.3 10.0 11.0 12.0 13.0 0 0 0 0 3.2 000000 998.5 2.3 0.0 0.8
22 2 S 1 6 05 12.0 83 16.2 8.5 6.0 9.2 9.8 10.2 11.0 12.0 12.9 1 2 3 0 tr 000000 990.0 0.0 0.0 1.4
23 7 00 0 6 03 10.7 91 14.5 8.7 4.4 9.5 10.0 10.6 11.2 12.0 12.7 1 1 1 0 1.7 000000 983.0 3.2 0.0 1.3
24 8 E 1 6 61 10.5 97 11.0 8.3 4.5 9.5 10.0 10.7 11.3 12.0 12.7 1 3 3 0 22.3 000000 979.0 24.0 0.0 0.0
25 8 NW 1 5 61 11.0 100 13.2 10.1 9.7 10.9 11.0 11.2 11.4 11.9 12.5 1 3 3 0 1.8 000000 987.8 0.7 0.0 0.3
26 7 NW 1 5 01 11.0 100 13.5 9.5 6.7 10.9 11.0 11.5 11.8 12.0 12.5 1 2 3 0 tr 000000 1014.6 0.0 0.0 0.8
27 7 S 5 7 02 11.7 88 14.0 9.6 7.3 10.7 11.0 11.5 11.9 12.1 12.6 1 0 3 0 5.6 000000 1020.8 4.0 0.0 2.0
28 3 00 0 7 01 7.7 99 14.2 7.0 2.5 8.6 10.0 11.2 11.7 12.2 12.6 1 2 1 0 0.0 000000 1022.7 0.0 0.0 1.1
29 7 SW 2 7 02 11.4 86 18.0 4.6 0.0 8.8 8.9 10.0 11.1 12.0 12.6 1 0 1 0 1.7 000000 1022.7 0.9 0.0 3.1
30 7 S 6 7 03 15.5 79 16.5 11.4 9.3 12.5 12.1 11.7 11.7 11.8 12.3 1 0 0 0 9.4 0000G0 996.8 1.9 0.0 3.0
31 2 S 6 5 05 11.2 74 13.7 9.4 6.8 9.0 9.8 10.6 11.4 12.0 12.5 1 0 0 0 5.4 0000G0 1010.3 2.1 0.0 2.4
------------------------------------------------------------------------------------------------------------------------
Mean
5 10.6 87 14.3 8.1 5.4 9.9 10.5 11.4 12.2 12.9 13.5 1013.3
Total 96.9 75.3 0.0 38.0
------------------------------------------------------------------------------------------------------------------------
(.) Difference from 1989-98 average used by the Climatological Observers Link. Rainfall was 89% of average
Air temperatures Weather (No. days occurrence) and 84% of 1961-90 average.
Mean maximum 14.3 (+0.5) Sleet/snow falling 0 ( 0.0) Most in a day: 22.3 mm on 24th.
Mean minimum 8.1 (+0.4) Snow lying (at 09GMT) 0 ( 0.0) No. of days with:
Mean 11.2 (+0.4) Hail <5 mm 1 [-0.2] >=0.2 mm 16 (- 3.2)
No. days <0.0C 0 ( 0.0) Hail >=5 mm 0 [all hail] >=1.0 mm 15 (- 0.7)
Mean grass min 5.4 (-0.1) Thunder heard 0 (-0.5) >=5.0 mm 8 (+ 0.6)
Lowest grass min 0.0 (-0.5) Gales 3 Lysimeter:
No. days <0.0C 0 (-2.6) Fog (at 09GMT) 0 PE 17.5 mm
PWB 79.4 mm
Highest maximum 18.0C on 29th. Lowest minimum 4.6 on 19 & 29th. PWS 85.3 mm
Minimum relative humidity: 57% on 5th PWD -5.9 mm
* Piche: 38.0 ml
------------------------------------------------------------------------------------------------------------------------
Key: Observations at 09GMT...
DD date; N cloud (oktas, 9=obscured); dd wind direction (8 sectors, 00=calm); ff wind speed (Beaufort scale);
V visibility (0 dense fog, 1 thick fog, 2 fog, 3 moderate fog, 4 very poor, 5 poor, 6 moderate, 7 good, 8 very good);
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 04 smoke haze, 05 haze,
20 drizzle in past hour, 25 shower in past hour, 61 continuous slight rain, intermittent moderate rain.
Temperatures (degC); RH relative humidity (%); soil temperatures are under bare soil and earth under grass (degC);
SS snow depth (cm); Press air pressure, aneroid (mb). For state of the ground E, concrete C, and grass Gr codes consult
'Recording Atmospheric Depositions on Grass' page.
24 hour observations...
Max maximum temperature (degC) beginning 09GMT; Min minimum temperature ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning 09GMT;
Rain rainfall beginning 09GMT (mm); Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of frost (00-24GMT).
Monthly observations...
PE Potential evapotranspiration, PWB Potential water balance, PWS Potential water surplus, PWD Potential water deficit.
Weather: days with...
s slight or S heavy snow/sleet falling; L >=50% snow cover at 09GMT; H categories of hail: 3 snow pellets,
4 ice pellets, 5 hail 5-9 mm, 6 hail 10-19 mm; t slight or T heavy thunder heard; G gale; F fog at 09GMT.
------------------------------------------------------------------------------------------------------------------------
CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR NOVEMBER 1999
------------------------------------------------------------------------------------------------------------------------
-09GMT--> -Air Temperature- --Soil temp-- --Earth temp-- -State Grd.- Weather Rain Fr. Pch
DD N dd ff V ww Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 100cm E C Gr SS Rain SLHTGF Press hrs hrs Evap
------------------------------------------------------------------------------------------------------------------------
01 8 S 6 5 60 11.7 96 12.4 9.5 9.5 11.0 10.8 11.0 11.3 11.8 12.3 1 3 3 0 6.1 000000 999.3 4.7 0.0 0.9
02 7 SW 2 7 80 7.5 93 11.5 6.9 3.8 7.7 8.8 10.0 11.0 11.8 12.2 1 2 3 0 1.3 000000 1015.4 2.4 0.0 1.4
03 7 SW 4 6 02 11.5 88 12.7 7.5 6.2 10.0 10.0 10.5 11.0 11.5 12.0 1 2 3 0 0.2 000000 1026.5 0.0 0.0 1.6
04 8 SW 5 7 02 11.5 85 12.5 10.6 9.3 10.1 10.3 10.8 11.1 11.6 12.2 1 2 3 0 26.3 000000 1018.1 8.3 0.0 1.7
05 8 SW 2 6 63 10.3 96 10.9 10.1 9.8 10.7 11.0 11.0 11.2 11.6 11.8 2 3 3 0 14.0 004000 988.7 6.6 0.0 0.6
06 6 NW 2 7 01 6.9 87 11.5 5.8 2.8 7.0 8.2 9.5 10.6 11.5 12.0 1 2 3 0 0.1 000000 1012.7 0.0 0.0 0.8
07 8 SW 2 7 02 10.2 91 11.9 4.0 -0.2 8.5 8.5 9.2 10.2 11.2 12.0 1 0 1 0 0.2 000000 1024.6 0.1 0.0 0.7
08 7 NW 1 7 01 10.1 91 11.7 9.3 6.8 9.8 9.8 10.1 10.5 11.1 11.8 1 2 3 0 0.4 000000 1031.6 0.6 0.0 0.3
09 4 NE 2 7 04 8.5 96 11.6 6.0 1.5 7.5 8.8 10.0 10.5 11.1 11.8 1 2 1 0 0.0 000000 1041.2 0.0 0.0 0.3
10 1 NE 1 7 04 6.2 98 11.3 4.0 0.5 5.3 6.8 8.8 9.8 11.0 11.7 1 0 1 0 0.0 000000 1044.3 0.0 0.0 0.6
11 7 NE 3 7 04 8.6 85 9.6 5.7 2.0 8.0 8.5 9.0 9.8 10.8 11.5 1 1 1 0 tr 000000 1043.6 0.0 0.0 0.7
12 8 NE 1 5 51 8.3 96 9.6 8.0 7.3 8.5 8.9 9.2 9.9 10.7 11.5 1 2 3 0 0.2 000000 1036.6 0.0 0.0 0.4
13 7 NE 1 7 50 9.0 96 11.2 8.1 6.7 8.9 9.0 9.5 10.0 10.6 11.4 1 1 3 0 tr 000000 1032.3 0.0 0.0 0.7
14 7 NE 1 5 25 9.5 93 10.9 5.2 1.5 8.5 8.8 9.4 10.0 10.6 11.4 1 1 3 0 0.7 000000 1028.3 1.5 0.0 0.3
15 6 NW 2 3 42 7.7 100 10.2 7.0 4.5 8.3 9.0 9.7 10.0 10.6 11.4 1 2 3 0 4.8 000000 1025.7 2.5 0.0 0.2
16 5 NW 3 7 01 4.6 98 8.5 2.8 -0.8 5.8 7.0 8.5 9.8 10.5 11.3 1 2 4 0 5.3 004000 1018.9 4.3 0.0 0.7
17 7 N 4 7 02 5.4 72 7.0 3.8 0.4 5.4 6.6 8.0 9.0 10.0 11.0 1 2 4 0 7.8 004000 1021.2 14.0 0.0 0.7
18 6 N 5 7 01 4.1 82 5.9 3.7 1.7 5.5 6.7 8.0 8.8 10.0 11.0 1 2 3 0 0.0 000000 1015.4 0.0 0.0 2.4
19 7 NE 5 7 01 5.7 82 7.7 4.1 2.5 5.0 5.5 7.0 8.3 9.8 10.8 1 0 0 0 tr 000000 1025.4 0.0 0.0 1.3
20 2 N 3 7 05 5.1 78 9.2 3.3 0.0 4.0 5.1 6.6 7.8 9.2 10.8 1 0 1 0 0.0 000000 1028.7 0.0 0.0 1.2
21 6 NE 1 7 04 0.3 86 7.5 -0.4 -3.5 2.5 4.0 5.9 7.2 8.9 10.2 3 0 7 0 3.8 000000 1023.5 5.0 8.5 0.8
22 6 NW 2 7 01 5.4 98 9.9 0.3 -1.8 5.9 6.3 7.2 7.2 8.5 10.1 1 2 3 0 0.4 000000 1016.6 0.6 0.0 0.4
23 8 SW 2 5 02 9.9 95 11.1 5.4 2.9 8.0 7.7 7.6 7.8 8.5 10.0 1 2 3 0 2.2 000000 1018.5 1.6 0.0 1.4
24 8 S 7 4 63 10.8 94 11.4 9.9 9.1 9.3 9.3 8.9 8.7 9.0 10.0 1 3 3 0 22.8 000000 1014.6 4.9 0.0 0.1
25 2 SW 2 7 04 7.8 96 11.7 6.2 3.0 7.0 7.8 9.0 9.0 9.4 9.9 1 2 1 0 0.2 000000 1021.2 0.0 0.0 2.0
26 8 S 7 5 60 10.7 85 11.4 7.8 6.6 9.2 9.3 9.2 9.4 9.4 9.9 1 3 3 0 7.0 0000G0 1007.5 2.2 0.0 1.1
27 6 SW 2 7 05 5.9 89 12.2 5.1 2.3 5.0 6.2 7.8 8.6 9.5 10.0 1 2 1 0 0.3 000000 1016.2 0.4 0.0 2.3
28 8 S 7 5 60 11.6 87 12.0 5.9 4.2 9.5 9.3 9.0 9.0 9.4 10.0 1 2 3 0 6.9 0000G0 998.9 7.1 0.0 1.0
29 5 W 1 7 05 2.5 93 10.5 2.5 -0.4 4.8 6.4 8.0 8.8 9.5 10.2 1 1 5 0 0.1 000000 1018.5 0.0 0.0 1.1
30 7 SW 6 5 02 10.5 90 11.7 2.5 -0.2 8.0 7.5 7.5 8.0 9.0 10.0 1 1 0 0 0.9 000000 1019.7 0.3 0.0 1.0
------------------------------------------------------------------------------------------------------------------------
Mean
6 7.9 90 10.6 5.7 3.3 7.5 8.1 8.9 9.5 10.3 11.1 1021.1
Total 112.0 67.1 8.5 28.7
------------------------------------------------------------------------------------------------------------------------
(.) Difference from 1989-98 average used by the Climatological Observers Link. Rainfall was 91.2% of average
Air temperatures Weather (No. days occurrence) and 90.7% of 1961-90 ave.
Mean maximum 10.6 (+0.2) Sleet/snow falling 0 (-0.6) Most in a day: 26.3 mm on 4th.
Mean minimum 5.7 (+0.8) Snow lying (at 09GMT) 0 (-0.2) No. of days with:
Mean 8.2 (+0.5) Hail <5 mm 3 [+0.1] >=0.2 mm 21 (+ 0.5)
No. days <0.0C 1 (-2.0) Hail >=5 mm 0 [all hail] >=1.0 mm 12 (- 4.2)
Mean grass min 3.3 (+0.8) Thunder heard 0 (-0.6) >=5.0 mm 8 (+ 0.1)
Lowest grass min -3.5 ( 0.0) Gales 2 Lysimeter:
No. days <0.0C 6 (-8.8) Fog (at 09GMT) 0 PE 8.5 mm
PWB 103.5 mm
Highest maximum 12.7C on 3th. Lowest minimum -0.4 on 21st. PWS 104.6 mm
Minimum relative humidity: 64% on 20th. *Hi max lowest on record for November! PWD -1.1 mm
* Mean 8.2C 4th warmest and Mean min 3rd warmest on record. Piche: 28.7 ml
------------------------------------------------------------------------------------------------------------------------
Key: Observations at 09GMT...
DD date; N cloud (oktas, 9=obscured); dd wind direction (8 sectors, 00=calm); ff wind speed (Beaufort scale);
V visibility (0 dense fog, 1 thick fog, 2 fog, 3 moderate fog, 4 very poor, 5 poor, 6 moderate, 7 good, 8 very good);
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 04 smoke haze, 05 haze,
25 shower in past hour, 42 fog thinning, 50 sl. drizzle, 51 cont. mod. drizzle, 60 int. sl. rain, 63 cont. mod. rain
Temperatures (degC); RH relative humidity (%); soil temperatures are under bare soil and earth under grass (degC);
SS snow depth (cm); Press air pressure, aneroid (mb). For state of the ground E, concrete C, and grass Gr codes consult
'Recording Atmospheric Depositions on Grass' page.
24 hour observations...
Max maximum temperature (degC) beginning 09GMT; Min minimum temperature ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning 09GMT;
Rain rainfall beginning 09GMT (mm); Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of frost (00-24GMT).
Monthly observations...
PE Potential evapotranspiration, PWB Potential water balance, PWS Potential water surplus, PWD Potential water deficit.
Weather: days with...
s slight or S heavy snow/sleet falling; L >=50% snow cover at 09GMT; H categories of hail: 3 snow pellets,
4 ice pellets, 5 hail 5-9 mm, 6 hail 10-19 mm; t slight or T heavy thunder heard; G gale; F fog at 09GMT.
------------------------------------------------------------------------------------------------------------------------
CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR DECEMBER 1999
------------------------------------------------------------------------------------------------------------------------
-09GMT--> -Air Temperature- --Soil temp-- --Earth temp-- -State Grd.- Weather Rain Fr. Pch
DD N dd ff V ww Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 100cm E C Gr SS Rain SLHTGF Press hrs hrs Evap
------------------------------------------------------------------------------------------------------------------------
01 6 W 2 7 02 7.2 85 8.8 7.2 4.6 6.8 7.5 8.1 8.5 9.2 10.0 1 2 3 0 tr 000000 1020.1 0.0 0.0 1.2
02 7 W 2 7 05 4.7 82 11.0 3.9 0.8 4.4 5.7 7.2 8.1 8.9 10.0 1 0 1 0 15.1 000000 1023.1 5.5 0.0 1.4
03 7 W 7 7 01 7.5 80 7.5 4.7 3.7 7.8 8.2 8.1 8.2 8.8 10.0 1 3 3 0 tr 0040G0 998.9 0.0 0.0 1.4
04 6 NW 4 6 87 4.0 83 6.0 3.2 0.4 3.7 4.8 6.1 7.3 8.7 9.9 1 1 4 0 tr 004000 1008.7 0.0 0.0 0.7
05 7 SW 1 7 04 1.4 96 10.2 1.0 -2.1 2.2 3.7 5.2 6.5 8.1 9.8 1 0 5 0 5.4 000000 1023.1 4.1 0.0 0.7
06 8 SW 5 5 50 10.2 96 10.7 1.4 -0.1 8.5 8.0 7.3 7.5 8.2 9.7 1 3 3 0 10.8 000000 1010.3 6.2 0.0 0.8
07 7 W 4 7 02 6.7 88 9.0 6.1 4.5 6.5 7.2 7.6 7.9 8.2 9.2 1 2 4 0 9.4 005000 1004.6 4.1 0.0 1.4
08 8 S 5 4 63 9.0 99 9.8 5.0 2.4 7.3 7.0 7.0 7.5 8.4 9.4 2 3 3 0 5.2 0000G0 997.2 2.5 0.0 2.1
09 8 SW 6 5 61 6.0 86 7.4 5.7 4.2 5.5 6.0 6.8 7.4 8.2 9.4 1 3 3 0 5.9 0000G0 980.8 5.1 0.0 0.4
10 6 SW 1 6 10 3.6 98 9.8 3.6 0.2 4.5 5.6 6.5 7.1 8.2 9.2 1 2 4 0 8.5 004000 998.9 8.5 0.0 0.6
11 8 SW 3 5 60 9.5 99 9.7 3.5 1.2 8.2 7.7 7.2 7.4 8.0 9.1 1 3 3 0 26.5 000000 981.2 13.2 0.0 0.4
12 8 00 0 5 63 5.0 100 5.7 5.0 4.6 6.2 6.8 7.2 7.5 8.2 8.8 2 3 3 0 10.3 000000 985.2 6.1 0.0 0.3
13 7 NW 1 7 01 3.9 93 4.7 2.7 -0.4 3.6 4.5 5.7 6.8 7.9 8.9 1 2 6 0 8.7 004000 998.5 6.3 0.0 0.1
14 8 SE 1 4 85 0.5 100 4.0 -0.2 -3.0 1.6 3.0 4.6 5.8 7.5 8.8 6 7 9 1 1.3 s15t00 997.6 0.8 1.8 1.5
15 6 NE 4 7 03 3.7 70 5.5 0.5 0.1 2.2 3.3 4.4 5.3 6.9 8.5 1 0 0 0 0.2 000000 1022.0 0.0 0.0 1.0
16 6 N 1 6 80 4.1 98 10.2 3.1 -1.0 2.5 3.5 4.5 5.0 6.8 8.2 1 2 4 0 15.6 0000G0 1025.7 7.0 0.0 1.1
17 7 W 2 6 02 9.0 100 9.0 4.1 1.1 7.5 6.9 6.1 6.2 6.7 8.2 1 2 3 0 tr 000000 1000.1 0.0 0.0 0.6
18 4 00 0 8 04 0.2 76 2.7 -0.6 -5.3 1.6 3.2 4.8 5.5 6.7 8.0 1 1 7 0 0.0 000000 1014.6 0.0 1.6 0.9
19 1 N 4 8 01 1.2 64 3.8 -0.1 -3.5 1.1 2.3 3.5 4.8 6.5 7.9 3 0 5 0 0.0 000000 1023.1 0.0 2.6 1.1
20 7 00 0 7 04 0.0 84 7.2 -2.2 -5.5 0.6 1.6 2.9 3.8 5.6 7.8 3 0 7 0 0.9 000000 1028.0 1.7 6.8 2.3
21 2 S 1 6 01 7.0 94 10.0 0.8 -0.7 4.0 3.8 3.7 4.1 5.5 7.6 1 2 3 0 0.0 0000G0 1011.1 0.0 0.0 2.6
22 8 S 7 6 02 10.0 69 10.2 7.0 4.4 6.1 5.7 5.1 5.2 5.5 7.5 1 1 0 0 5.7 000000 1004.6 5.0 0.0 1.6
23 7 S 3 6 60 7.4 80 9.5 5.1 2.3 4.5 5.0 5.2 5.8 6.2 7.5 1 1 3 0 11.7 0000G0 1008.3 4.2 0.0 2.2
24 7 S 4 5 01 8.0 79 10.8 7.2 4.9 5.7 6.0 6.2 6.3 6.7 7.5 1 2 4 0 5.6 0050G0 991.3 3.8 0.0 1.7
25 7 SW 3 7 01 2.7 91 5.7 2.7 1.2 3.9 5.0 6.0 6.3 6.1 7.5 1 2 6 0 8.5 005T00 979.5 0.5 0.0 1.6
26 7 W 4 7 01 3.5 97 5.1 2.7 0.2 2.0 3.5 4.8 5.5 6.5 7.7 5 6 6 0 2.0 106000 979.0 2.2 0.0 0.5
27 7 W 1 7 87 3.5 91 4.5 2.8 -0.5 2.5 3.2 4.0 5.0 6.2 7.6 1 2 6 0 3.1 005000 988.7 1.8 0.0 0.1
28 7 NW 1 7 87 1.2 96 5.2 0.3 -2.7 1.2 2.3 3.5 4.7 5.9 7.5 5 5 6 0 1.0 004000 1001.4 0.2 0.0 0.2
29 4 NW 1 7 02 1.1 100 7.0 0.5 -3.2 1.0 1.8 3.0 3.8 5.5 7.4 3 4 7 0 12.8 000000 1015.4 6.1 0.0 1.3
30 8 SW 3 4 63 5.8 97 8.0 1.0 -2.1 4.0 3.5 3.4 4.0 5.2 7.1 2 3 3 0 13.2 000000 1013.9 6.2 0.0 0.2
31 5 S 2 7 01 7.1 91 9.4 5.8 4.2 5.3 5.2 5.0 5.0 5.5 6.8 1 2 3 0 6.4 000000 1015.0 4.6 0.0 0.3
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Mean
6 5.0 89 7.7 3.0 0.5 4.3 4.9 5.5 6.1 7.1 8.5 1004.8
Total 193.8 105.7 12.8 32.3
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(.) Difference from 1989-98 average used by the Climatological Observers Link. Rainfall was 166.7% of average
Air temperatures Weather (No. days occurrence) and 171.4% of 1961-90 ave.
Mean maximum 7.7 (-0.1) Sleet/snow falling 2 (-0.3) Most in a day: 26.5 mm on 11th.
Mean minimum 3.0 (+0.2) Snow lying (at 09GMT) 1 (+0.3) No. of days with:
Mean 5.4 (+0.1) Hail <5 mm 5 [+7.0] >=0.2 mm 24 (+ 4.7)
No. days <0.0C 4 (-2.4) Hail >=5 mm 6 [all hail] >=1.0 mm 22 (+ 7.3)
Mean grass min 0.5 (+0.2) Thunder heard 2 (+1.6) >=5.0 mm 18 (+10.0)
Lowest grass min -5.5 (+0.6) Gales 7 Lysimeter:
No. days <0.0C 13 (-1.8) Fog (at 09GMT) 0 PE 0.9 mm
PWB 192.9 mm
Highest maximum 11.0C on 2nd lowest since 1993. Lowest minimum -2.2C on 20th. PWS 192.9 mm
Minimum relative humidity: 53% on 20th. PWD 0.0 mm
* Most no. days (11) with hail (all types) in December on record (1979). Piche: 32.3 ml
Wettest December since 1994 (when 205.1 mm) and 5th wettest on record (since 1928).
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Key: Observations at 09GMT...
DD date; N cloud (oktas, 9=obscured); dd wind direction (8 sectors, 00=calm); ff wind speed (Beaufort scale);
V visibility (0 dense fog, 1 thick fog, 2 fog, 3 moderate fog, 4 very poor, 5 poor, 6 moderate, 7 good, 8 very good);
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 04 smoke haze, 05 haze,
50 slight drizzle, 60 intermittent sl. rain, 61 continuous sl. rain, 63 cont. moderate rain, 80 sl. rain shower,
86 moderate snow shower, 87 shower of ice pellets.
Temperatures (degC); RH relative humidity (%); soil temperatures are under bare soil and earth under grass (degC);
SS snow depth (cm); Press air pressure, aneroid (mb). For state of the ground E, concrete C, and grass Gr codes consult
'Recording Atmospheric Depositions on Grass' page.
24 hour observations...
Max maximum temperature (degC) beginning 09GMT; Min minimum temperature ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning 09GMT;
Rain rainfall beginning 09GMT (mm); Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of frost (00-24GMT).
Monthly observations...
PE Potential evapotranspiration, PWB Potential water balance, PWS Potential water surplus, PWD Potential water deficit.
Weather: days with...
s slight or S heavy snow/sleet falling; L >=50% snow cover at 09GMT; H categories of hail: 3 snow pellets,
4 ice pellets, 5 hail 5-9 mm, 6 hail 10-19 mm; t slight or T heavy thunder heard; G gale; F fog at 09GMT.
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Annual summary statistics at Llansadwrn, Anglesey for 1999
(.) Difference from 1989-98 average used by the Climatological Observers Link. Total rainfall 1286.1 mm
Air temperatures Weather (No. days occurrence) was 126% of average
Mean maximum 13.6 (+0.1) Sleet/snow falling 10 (-2.2) Most in a day: 33.8 (Sep 6),
Mean minimum 7.4 (+0.6) Snow lying (at 09GMT) 2 (-1.2) 31.2 mm (Jan 5).
Mean 10.5 (+0.4) Hail <5 mm 25 [+17.8] No. of days with:
No. days <0.0C 13 (-8.5) Hail >=5 mm 12 [all hail] >=0.2 mm 226 (+27)
Mean grass min 5.3 (+0.8) Thunder heard 11 (+4.9) >=1.0 mm 178 (+27)
Lowest grass min -6.3 (+0.9) Gales 30 >=5.0 mm 95 (+26)
No. days <0.0C 51 (-16.8) Fog (at 09GMT) 3 Lysimeter:
PE 671.0 mm
Highest maximum 27.5 on Jul 31st. Lowest minimum -2.2 on Dec 20th. PWB 615.1 mm
Minimum relative humidity: 45% on Apr 19th. PWS 926.3 mm
* Wettest year since 1967. Frost-free (air) from Apr 17th to Nov 20th. PWD -311.2 mm
Piche: 440.8 mls
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Comparison of annual values with recent years
-Air Temperature- Earth --------------Weather--------------
Year Max Min Mean Gmin 30cm Rain AF GF SF SL H T F
1991 13.1 6.2 9.7 4.5 10.2 832.2 35 75 9 4 12 3 1
1992 13.1 6.6 9.8 5.0 10.5 1209.7 21 64 0 0 15 11 2
1993 12.8 6.3 9.6 4.7 10.4 1001.0 18 60 9 1 20 5 8
1994 12.9 6.8 9.9 5.0 10.7 1185.8 15 61 10 3 11 7 1
1995 13.8 7.1 10.5 5.2 11.4 895.8 21 66 35 8 33 6 4
1996 12.8 6.2 9.5 3.9 10.4 793.7 40 90 22 7 29 8 2
1997 14.0 7.4 10.7 4.8 11.4 1008.3 17 80 7 5 19 8 1
1998 13.6 7.5 10.6 5.3 11.5 1215.5 9 60 7 0 36 9 2
1999 13.6 7.4 10.5 5.3 11.6 1286.1 13 51 10 2 37 11 3
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Annual data for 1999
No. of days occurrence at 0900 GMT.
Cloud cover Wind direction Wind speed Visibility Code Description
Cloud obscured 4 N 30 Calm 28 <100 m 0 Dense fog 0
8/8 cloud 113 NE 40 Force 1-3 235 100-190 m 1 Thick fog 2
6/8 to 7/8 149 E 18 Force 4-5 80 200-390 m 2 Fog 1
3/8 to 5/8 54 SE 13 Force 6-7 22 400-900 m 3 Mod. fog 2
1/8 to 2/8 39 S 56 Force 8-12 0 1.0-1.9 km 4 Very poor 18
Sky cloudless 6 SW 111 2.0-3.9 km 5 Poor 82
W 33 Days 365 4.0-9.0 km 6 Moderate 65
Days 365 NW 36 10 km or more 7 Good 195
Calm 28
Days 365
Days 365
For information on the state of the grass, ground and concrete
codes consult the 'Recording Atmospheric Depositions on Grass' page.
State of grass (Atmospheric depositions on grass)
Code 0 1 2 3 4 5 6 7 8 9 Days
Jan 3 3 1 15 2 2 0 5 0 0 31
Feb 2 10 1 7 1 3 3 0 0 1 28
Mar 1 8 1 16 4 1 31
Apr 0 7 0 18 3 0 1 0 0 1 30
May 3 13 0 15 0 31
Jun 1 15 0 13 1 0 30
Jul 1 20 0 10 0 0 31
Aug 0 19 1 11 31
Sep 3 12 0 15 30
Oct 3 15 0 13 31
Nov 2 7 0 17 2 1 0 1 30
Dec 2 1 0 12 5 2 5 3 0 1 31
Yr 21 130 4 162 18 9 9 9 0 3 365
State of ground
Code 0 1 2 3 4 5 6 7 8 9 Days
Jan 0 17 10 4 0 0 0 0 31
Feb 0 24 1 2 0 0 1 0 28
Mar 0 28 2 1 31
Apr 3 24 1 1 0 0 1 30
May 14 17 31
Jun 11 19 30
Jul 19 12 31
Aug 7 24 0 31
Sep 5 21 4 30
Oct 1 28 2 31
Nov 0 28 1 1 30
Dec 0 22 3 3 0 2 1 0 0 31
Yr 60 264 24 12 0 2 3 0 0 0 365
State of concrete
Code 0 1 2 3 4 5 6 7 8 9 Days
Jan 1 6 13 7 4 31
Feb 9 2 13 2 0 1 1 0 0 0 28
Mar 13 2 11 5 31
Apr 10 2 12 5 0 1 30
May 18 1 6 6 31
Jun 22 3 2 3 30
Jul 25 3 2 1 31
Aug 22 1 3 5 31
Sep 15 2 7 6 30
Oct 17 3 7 4 31
Nov 5 5 16 4 30
Dec 5 4 11 7 1 1 1 1 0 31
Yr 162 34 103 55 5 3 2 1 0 0 365
These pages are designed and written by Donald Perkins © 1998 - 1999Page dated 1 January 1999: http://www.llansadwrn-wx.co.uk |