Llansadwrn (Anglesey) Weather Observations from the observer's spreadsheet View using Firefox, Opera or Internet Explorer, with screen resolution 1152 x 864 or greater. Use F11 toggle to fill your screen

Key to observations

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CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR MAY 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	6	SW	5	5	01	13.6	12.3	92	16.5	10.6	13.6	9.0	14.4	13.0	12.8	12.6	12.1	11.0	1	2	3	0	1.4	17.9				t			1004		0.0	1.5
2	7	S	4	6	05	12.8	10.5	86	14.8	11.2	13.0	9.5	13.5	13.0	13.0	13.0	12.4	11.2	1	1	3	0	3.4	10.2							1007	3.0	0.0	1.1
3	7	S	2	7	05	12.9	10.2	84	15.8	10.9	13.4	9.8	14.2	12.8	12.7	12.9	12.9	11.3	1	0	3	0	5.1	13.5							1006	4.7	0.0	1.0
4	7	N	5	7	01	9.7	7.8	88	12.8	7.7	10.3	7.5	12.7	11.8	12.7	12.8	12.5	11.5	1	2	3	0	0.0	23.6							1023	0.0	0.0	1.7
5	7	W	3	7	02	12.5	9.6	82	13.8	6.3	10.1	4.2	14.0	12.8	12.5	13.1	12.8	11.5	1	2	1	0	0.9	10.7							1024	1.2	0.0	0.6
6	6	W	3	8	01	11.4	7.0	74	13.6	6.6	10.1	4.3	12.7	11.5	12.1	12.9	12.8	11.8	1	0	3	0	8.2	17.0							1020	5.3	0.0	1.1
7	7	NW	4	7	01	9.0	6.9	86	13.7	6.4	10.1	4.3	12.5	11.8	12.2	12.8	12.8	11.9	1	2	3	0	0.3	14.3							1015	0.2	0.0	0.9
8	7	NW	4	7	02	9.4	5.5	76	11.7	4.5	8.1	1.8	10.8	10.0	11.0	12.4	12.5	11.8	1	0	3	0	0.2	19.2							1016	0.1	0.0	1.3
9	6	N	4	7	02	8.6	4.8	77	10.8	4.2	7.5	1.4	11.6	10.3	11.0	12.3	12.3	12.0	1	0	1	0	0.0	28.9							1019	0.0	0.0	1.9
10	2	NE	1	8	02	9.8	4.9	72	11.6	3.6	7.6	0.5	11.0	9.5	11.0	12.5	12.5	11.9	1	0	1	0	0.0	30.9							1023	0.0	0.0	2.2
11	6	NE	1	8	03	11.0	3.0	58	13.0	3.4	8.2	0.2	12.0	10.2	11.2	12.6	12.6	11.9	1	0	1	0	0.0	28.2							1027	0.0	0.0	2.5
12	5	E	1	7	03	11.8	3.5	57	15.9	4.5	10.2	1.0	12.0	10.3	11.8	12.8	12.6	11.9	1	0	1	0	0.0	30.3							1023	0.0	0.0	2.8
13	3	E	5	7	04	10.5	4.2	65	14.8	5.7	10.3	3.5	14.0	11.7	12.3	13.3	13.0	12.0	0	0	0	0	0.0	31.7							1023	0.0	0.0	3.3
14	3	NE	5	8	02	8.5	3.9	73	14.1	6.8	10.5	5.2	12.8	11.7	12.2	13.3	13.2	12.0	0	0	0	0	0.0	32.2							1021	0.0	0.0	3.5
15	4	NE	1	7	03	13.0	0.4	42	14.8	4.7	9.8	2.1	15.7	12.8	12.5	13.5	13.2	12.2	0	0	0	0	tr	25.8							1020	0.0	0.0	2.1
16	8	N	2	5	62	9.7	8.5	92	10.9	7.9	9.4	5.8	14.0	13.5	13.8	14.0	13.5	12.3	0	1	3	0	0.3	12.4							1017	0.2	0.0	0.9
17	7	NE	3	7	89	9.5	5.1	74	10.5	4.6	7.6	2.2	11.0	10.7	12.0	13.2	13.3	12.5	0	2	4	0	0.2	27.3			5				1021	0.0	0.0	1.9
18	8	S	5	7	02	9.8	4.4	69	12.0	4.5	8.3	2.5	12.2	11.7	12.2	13.3	13.3	12.5	0	0	0	0	3.9	11.2							1021	1.4	0.0	2.1
19	8	S	4	5	80	12.0	11.4	96	15.5	8.0	11.8	6.5	13.0	12.5	12.1	12.8	13.1	12.5	1	3	3	0	2.1	14.5							1018	2.0	0.0	1.6
20	7	S	7	7	25	11.7	10.7	94	13.7	11.3	12.5	10.2	13.1	12.8	13.0	13.3	13.2	12.5	1	3	3	0	tr	12.1							1022	0.0	0.0	1.5
21	8	S	3	7	80	11.2	6.6	73	15.0	7.6	11.3	6.4	13.1	11.4	11.8	12.8	13.0	12.5	1	1	3	0	3.0	17.8							1005	2.3	0.0	1.3
22	6	SW	4	7	02	11.8	8.6	81	15.2	7.0	11.1	5.4	14.6	12.5	12.4	13.2	13.1	12.5	1	0	3	0	4.9	21.2							1002	3.6	0.0	1.6
23	6	SW	6	7	05	11.0	6.1	72	13.3	5.3	9.3	3.4	13.0	11.7	12.0	13.0	13.1	12.5	1	0	4	0	10.1	19.8			4		1		1007	8.4	0.0	2.3
24	8	S	5	5	10	11.7	11.3	98	14.6	8.3	11.5	7.8	13.5	12.3	12.2	13.0	13.0	12.5	1	3	3	0	7.3	14.5							1006	8.0	0.0	0.7
25	8	SW	6	6	10	12.3	11.9	98	16.2	10.0	13.1	9.6	13.0	12.8	12.9	13.1	13.0	12.5	1	3	3	0	4.2	11.0							1015	5.1	0.0	2.0
26	8	00	0	4	10	11.7	11.7	100	18.5	11.7	15.1	11.4	13.0	13.0	13.0	13.2	13.2	12.5	1	3	3	0	0.3	24.0							1013	0.2	0.0	2.0
27	7	NE	4	7	03	14.0	10.0	77	19.4	10.5	15.0	9.8	16.0	14.6	14.1	14.3	13.6	12.5	1	0	3	0	tr	18.1							1011	0.0	0.0	1.9
28	8	S	7	5	60	12.5	9.8	83	15.3	12.0	13.7	11.2	14.3	14.5	15.0	14.9	14.1	12.6	1	1	3	0	tr	20.0					1		1004	0.0	0.0	2.1
29	5	W	3	8	02	12.0	6.6	69	17.3	6.3	11.8	3.6	14.8	12.8	13.0	14.0	13.8	12.8	0	0	3	0	0.0	25.6							1020	0.0	0.0	2.0
30	3	00	0	8	02	14.0	6.8	62	17.6	6.6	12.1	3.5	16.9	13.7	13.2	14.3	14.0	12.9	0	0	1	0	1.5	23.4							1023	2.4	0.0	1.2
31	5	N	2	7	03	14.2	10.0	76	15.3	9.6	12.5	7.8	17.4	15.0	14.5	14.8	14.3	13.0	0	0	3	0	0.5	16.6							1025	0.5	0.0	1.0
N	78	%
Means---->						11.4	7.5	78	14.5	7.4	10.9	5.5	13.4	12.2	12.5	13.2	13.1	12.2						20.1							1016
Totals----->																							57.8	623.7	0	0	2	1	2	0		48.6	0.0	53.6
MEANS AND AVERAGES AT LLANSADWRN, ANGLESEY FOR MAY 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					14.5	-1.1	-1.5			Sleet/ snow falling				0	-0.3			N			4					Total				57.8	87	101	%
	Mean minimum					7.4	-0.5	0.4			Snow lying (at 09 GMT)				0	-0.1			NE			6					Largest fall				10.1
	Mean (max+min)/2					10.9	-0.8	-0.6			Hail <5 mm				1	0.4			E			2
	Highest maximum					19.4	-4.3				Hail >=5 mm				1	{All types}			SE			0				Evaporation (mm)
	Lowest maximum					10.5	0.4				Thunder heard				1	0.3			S			8					Lysimeter				PE	52.7
	Highest minimum					12.0	-1.1				Gales				2	n.a.			SW			4					Monthly total				PWB	5.1
	Lowest minimum					3.4	0.2				Fog (at 09 GMT)				0	n.a.			W			3									PWS	31.6
	No. days <0.0C					0	0.0			Rainfall (No. days occurrence)									NW			2									PWD	-27.3
Grass minimum mean						5.5	-0.5				Dry		0.0 mm		8	-5.1			Calm			2
Lowest minimum						0.2	0.1				Rain		>= 0.2 mm		19	4.7											Piche (ml)				53.6
	No. days <0.0C						0	-1.1				Wet		>= 1.0 mm		12	1.7			Check days			31
Earth temperature 30cm						13.2	-0.2						>= 5.0 mm		4	-0.7			This month			31

KEY: OBSERVATIONS AT 09 GMT 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.

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