Llansadwrn (Anglesey) Weather Observations from the observer's spreadsheet Usually updated on a Monday, but may be updated sooner during interesting weather. View using Firefox, Opera or Internet Explorer, with screen resolution 1152 x 864 or greater. Use F11 toggle to fill your screen

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CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR SEPTEMBER 2005
	------09 GMT--->					<-------Air temperature-------->							<---Soil temp--->			<---Earth temp--->			<--State Grd.-->				Rain	Sol	<-------Weather------->						Press	Rain	Fr.	Pch
DD	N	dd	ff	V	ww	Temp	Dpt	RH	Max	Min	Mean	Gmin	5cm	10cm	20cm	30cm	50cm	100cm	E	C	Gr	SS	mm	mvh	S	L	H	T	G	F	mb	hrs	hrs	evap
1	7	N	2	7	01	14.7	12.7	88	16.8	13.7	15.3	13.5	18.2	17.3	17.5	17.8	17.2	16.3	1	2	3		tr	10.4							1014	0.0		1.1
2	3	S	3	8	02	15.7	11.5	76	21.5	9.7	15.6	6.7	13.9	13.8	15.2	16.8	17.1	16.3	1	0	1		0.0	21.5							1026	0.0		2.0
3	6	SE	2	7	02	18.3	12.6	69	26.6	11.4	19.0	7.8	16.0	15.0	16.0	16.8	17.0	16.3	1	0	1		0.0	19.4							1027	0.0		2.6
4	6	SE	2	7	04	22.0	16.6	72	28.0	15.8	21.9	12.0	18.5	17.0	17.2	17.4	17.3	16.4	0	0	1		9.4	14.0				T			1020	1.5		1.9
5	8	S	1	5	10	17.3	16.5	95	21.8	16.2	19.0	15.5	18.9	18.3	18.1	18.0	17.5	16.3	1	2	3		0.0	10.3							1013	0.0		1.0
6	1	00	0	7	04	17.3	15.1	87	24.0	12.5	18.3	9.3	16.3	15.6	16.9	17.8	17.5	16.4	1	0	1		tr	18.4							1010	0.0		1.2
7	8	SW	5	7	02	15.5	14.1	91	19.3	13.9	16.6	12.0	16.3	16.5	17.4	17.8	17.5	16.5	1	0	1		3.1	9.1							1008	1.8		1.0
8	8	NW	1	8	02	15.3	14.4	95	17.0	14.8	15.9	14.5	17.0	17.0	17.2	17.5	17.3	16.6	1	2	3		10.3	6.4							1010	7.2		0.6
9	8	NE	1	7	61	15.7	15.5	99	16.5	13.5	15.0	13.2	17.0	16.6	16.9	17.2	17.2	16.5	1	2	3		1.3	4.6							1010	1.4		0.1
10	8	NE	3	6	10	16.0	15.5	97	16.7	15.2	16.0	14.0	16.7	16.6	16.8	17.2	17.0	16.3	1	3	3		0.6	5.3							1012	0.4		0.5
11	8	N	3	7	02	14.2	12.4	89	15.7	13.0	14.4	10.6	15.5	15.5	16.2	17.0	17.0	16.2	1	0	1		0.0	7.2							1019	0.0		1.1
12	6	00	0	7	10	15.7	14.8	95	22.8	10.5	16.7	7.7	15.0	14.4	15.7	16.5	16.8	16.4	1	0	1		0.0	17.6							1023	0.0		1.5
13	6	S	5	7	03	16.7	14.1	85	18.5	12.9	15.7	9.3	16.2	15.8	16.2	16.8	16.8	16.2	1	0	0		1.2	9.8							1023	1.2		1.6
14	8	W	2	7	03	14.3	13.0	92	17.1	12.7	14.9	10.8	16.2	16.2	16.5	16.8	16.6	16.2	1	2	3		10.5	6.6							1022	4.6		0.9
15	8	00	0	4	63	16.1	16.1	100	16.1	13.0	14.6	11.1	16.5	16.2	16.5	16.5	16.7	16.3	1	3	3		5.5	3.3							1013	4.7		1.2
16	3	NE	5	8	02	11.0	6.1	72	12.7	9.0	10.9	6.9	11.4	12.2	14.1	15.9	16.4	16.2	1	0	0		0.4	18.6							1023	0.9		2.0
17	4	NW	2	7	01	11.0	9.2	89	15.5	6.7	11.1	3.9	12.4	12.5	14.0	15.4	16.1	16.1	1	2	3		tr	13.3							1028	0.0		0.9
18	8	W	2	7	02	14.3	12.3	88	18.0	11.0	14.5	10.1	15.2	15.0	15.0	15.8	15.8	16.0	1	0	1		0.0	10.1							1028	0.0		1.5
19	7	S	5	7	03	14.3	11.1	81	18.2	11.0	14.6	9.0	13.8	13.4	14.2	15.5	16.0	15.8	1	0	0		0.4	11.0							1022	0.9		1.3
20	7	W	1	7	02	14.3	11.9	86	17.7	12.1	14.9	9.5	15.5	15.3	15.0	15.5	15.9	15.7	1	1	3		0.0	10.6							1024	0.0		1.0
21	6	S	1	7	02	13.5	10.5	82	16.7	8.8	12.8	4.7	13.3	13.2	14.2	15.3	15.8	15.8	1	0	1		1.1	7.3							1020	0.8		1.4
22	6	S	5	6	05	14.6	11.8	84	19.0	13.5	16.3	12.0	13.5	14.0	14.8	15.3	15.5	15.5	1	1	3		1.2	11.1							1015	0.6		2.3
23	8	S	3	7	21	14.3	11.5	83	16.4	13.0	14.7	11.9	14.5	14.7	15.0	15.3	15.5	15.5	1	2	3		0.7	7.2							1007	0.3		0.9
24	3	SE	1	7	05	9.9	5.0	72	16.5	5.0	10.8	1.5	10.3	10.8	13.0	14.8	15.4	15.5	1	0	1		1.1	12.9							1019	1.8		2.2
25	1	SW	4	7	01	14.0	11.2	83	18.0	9.7	13.9	7.7	12.8	13.2	14.0	14.8	15.1	15.2	1	2	3		tr	10.5							1005	0.0		1.2
26	8	S	5	7	02	14.2	11.8	85	16.6	9.2	12.9	6.0	13.0	13.0	13.8	14.5	15.0	15.1	1	0	0		12.5	5.2					1		1011	4.1		1.3
27	1	SW	5	7	05	13.6	10.6	82	16.3	12.2	14.3	10.3	13.6	13.3	14.0	14.5	15.1	15.1	1	2	3		0.0	13.3							1009	0.0		1.6
28	7	S	5	7	03	12.7	10.8	78	13.4	7.4	10.4	4.1	10.6	11.2	12.9	14.1	15.0	15.0	1	0	0		13.1	3.6							1016	5.9		0.6
29	5	W	3	7	05	9.8	9.0	89	16.0	6.6	11.3	3.2	9.7	10.3	11.8	13.3	14.3	15.0	1	2	3		6.2	10.7							1019	8.0		1.3
30	8	SW	5	3	47	15.5	15.5	100	16.7	9.8	13.3	6.7	15.1	14.5	14.0	14.0	14.4	14.9	1	3	3		7.0	2.6							1013	3.5		0.5
N	75	%
Means---->						14.7	12.4	86	18.2	11.5	14.8	9.2	14.8	14.6	15.3	16.1	16.3	15.9						10.4							1017
Totals----->																							85.6	311.7	0	0	0	1	1	0		49.6	0.0	38.3
MEANS AND AVERAGES AT LLANSADWRN, ANGLESEY FOR SEPTEMBER 2005
Differences from 1995-2004 average* as used by the Weather Observers Network & from 1971-2000 average**.
Air temperature (C)							*	**		Weather (No. days occurrence)						*		Wind direction (days)								Rainfall (mm)						*	**
	Mean maximum					18.2	0.6	1.2			Sleet/ snow falling				0	0.0			N			2					Total				85.6	80	93	%
	Mean minimum					11.5	0.7	1.8			Snow lying (at 09 GMT)				0	0.0			NE			3					Largest fall				13.1
	Mean (max+min)/2					14.8	0.6	1.5			Hail <5 mm				0	-0.7			E			0
	Highest maximum					28.0	4.5				Hail >=5 mm				0	{All types}			SE			3				Evaporation (mm)
	Lowest maximum					12.7	-1.0				Thunder heard				1	0.2			S			9					Lysimeter				PE	23.4
	Highest minimum					16.2	1.3				Gales				1	n.a.			SW			4					Monthly total				PWB	62.2
	Lowest minimum					5.0	-1.5				Fog (at 09 GMT)				0	n.a.			W			4									PWS	68.8
	No. days <0.0C					0	0.0			Rainfall (No. days occurrence)									NW			2									PWD	-6.6
Grass minimum mean						9.2	0.7				Dry		0.0 mm		8	-2.5			Calm			3
Lowest minimum						1.5	-1.6				Rain		>= 0.2 mm		18	2.4											Piche (ml)				38.3
	No. days <0.0C						0	0.0				Wet		>= 1.0 mm		14	2.1			Check days			30
Earth temperature 30cm						16.0	0.3						>= 5.0 mm		8	1.2			This month			30

  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 SYNOP code (eg. 01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 04 smoke haze, 05 haze)
  Temperatures (degC); Temp dry bulb temperature; Dpt dewpoint; RH relative humidity (%); soil temperatures are under bare
  soil and earth under grass; SS snow depth (cm); Press air pressure, aneroid (mb). For state of the ground E, concrete C,
  and grass Gr codes consult the page on 'Recording Atmospheric Depositions on Grass'.

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).
  Sol mv h Solar radiation (MV h) dawn to dusk. 

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: 1 ice crystals, 2 snow grains,
  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; Fog any hour 1, 09 GMT 9.

These pages are designed and written by Donald Perkins © 1998 - 2005 http://www.llansadwrn-wx.co.uk