Llansadwrn (Anglesey) Weather Observations from the observer's spreadsheet MAY 2007 View with screen resolution 1152 x 864 or greater. Use F11 toggle to fill your screen

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Key to observations.

CLIMATOLOGICAL OBSERVATIONS AT LLANSADWRN, ANGLESEY, FOR MAY 2007
	------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	MJ/m2	S	L	H	T	G	F	mb	hrs	hrs	evap
1	3	NE	5	8	05	12.3	7.6	73	21.8	8.5	15.2	4.8	13.5	11.8	13.0	14.0	13.7	12.6	0	0	0	0	0.0	24.91							1015.4	0.0	0.0	3.7
2	0	NE	4	7	04	10.8	5.9	71	17.2	8.5	12.9	5.5	14.9	13.2	13.5	14.0	14.0	12.9	0	0	0	0	0.0	25.03							1017.8	0.0	0.0	2.7
3	0	NE	4	6	04	13.7	8.1	69	14.8	8.4	11.6	4.8	15.8	13.0	13.8	14.3	14.0	12.9	0	0	1	0	0.0	25.30							1019.7	0.0	0.0	1.6
4	0	NE	3	7	04	12.2	7.3	72	14.3	7.8	11.1	4.1	16.0	13.1	13.8	14.5	14.0	12.9	0	0	1	0	0.0	25.46							1018.5	0.0	0.0	2.0
5	0	S	2	6	04	13.0	7.7	70	17.5	6.0	11.8	1.7	15.0	12.8	13.7	14.4	14.3	13.2	0	0	1	0	tr	21.83							1019.7	0.0	0.0	2.0
6	8	SW	5	7	04	12.2	8.8	80	12.5	11.0	11.8	10.2	15.1	14.6	14.8	14.5	14.2	13.1	0	0	0	0	1.9	7.55							1014.2	3.8	0.0	0.9
7	8	SW	3	8	02	11.0	9.0	87	14.7	8.4	11.6	7.3	13.5	13.0	13.2	13.9	14.0	13.2	1	1	3	0	3.9	11.93							1008.7	3.8	0.0	1.0
8	8	SW	5	7	10	11.8	9.2	84	14.2	9.0	11.6	6.6	13.3	12.4	12.8	13.7	13.8	13.2	1	2	3	0	1.3	9.85							1006.3	1.0	0.0	0.8
9	8	S	3	7	02	11.3	8.7	84	13.5	7.5	10.5	4.6	13.9	12.7	12.7	13.6	13.8	13.2	1	2	3	0	4.0	11.87							1011.9	4.1	0.0	1.6
10	5	SW	6	7	01	12.5	6.9	69	15.0	9.2	12.1	7.8	14.5	12.3	12.4	13.5	13.6	13.1	1	0	3	0	0.5	23.86							1002.2	0.3	0.0	2.5
11	7	W	3	7	05	11.4	8.2	80	15.0	8.5	11.8	8.0	14.0	13.0	13.0	13.6	13.5	13.0	1	1	3	0	2.5	13.28							1001.8	3.6	0.0	1.0
12	7	SW	3	7	05	12.0	9.4	84	16.2	9.4	12.8	8.0	14.5	13.2	13.0	13.8	13.6	13.0	1	1	3	0	0.6	16.70							999	0.6	0.0	1.3
13	7	NE	3	7	01	12.0	10.5	90	12.5	10.1	11.3	9.2	15.0	13.8	13.5	14.0	13.8	13.1	1	2	3	0	13.5	8.63							1000.1	8.6	0.0	1.0
14	4	N	4	8	01	9.5	5.8	78	15.2	7.5	11.4	6.8	13.0	11.5	12.2	13.5	13.6	13.2	1	1	3	0	1.8	20.81							1008.7	6.0	0.0	1.5
15	7	NE	3	5	10	11.9	9.3	84	14.2	8.2	11.2	6.1	16.0	13.7	13.0	14.0	13.8	13.1	1	2	3	0	3.4	22.04							1009.5	6.4	0.0	1.1
16	8	SW	3	6	61	10.8	10.4	97	13.2	8.0	10.6	4.0	13.9	13.4	13.6	14.3	14.0	13.2	1	3	3	0	16.3	5.82							1013.1	20.2	0.0	0.1
17	8	W	3	6	02	13.2	13.0	99	17.7	10.2	14.0	10.4	13.8	13.5	13.5	14.0	14.0	13.2	1	3	3	0	1.3	8.69							1013.8	0.5	0.0	1.0
18	8	SW	6	5	52	11.5	11.3	99	14.9	11.5	13.2	10.9	13.2	13.5	14.0	14.2	14.0	13.3	1	3	3	0	3.0	17.45					1		1005.5	3.3	0.0	2.6
19	7	SW	6	6	80	12.5	8.7	78	15.0	9.2	12.1	7.7	15.0	13.0	13.0	14.0	14.0	13.6	1	0	3	0	tr	21.25							1006.7	0.0	0.0	2.1
20	6	S	3	7	05	12.3	6.4	67	17.0	5.8	11.4	2.2	14.5	12.3	12.7	13.9	14.1	13.5	0	0	1	0	0.0	23.18							1016.6	0.0	0.0	1.6
21	5	NE	3	8	02	13.0	4.8	57	15.7	5.3	10.5	1.4	14.5	11.7	12.5	14.0	14.2	13.5	0	0	1	0	0.0	27.15							1019.7	0.0	0.0	2.2
22	8	S	2	6	03	12.6	9.9	84	17.8	8.2	13.0	3.8	14.5	13.6	13.8	14.5	14.3	13.5	0	0	1	0	0.0	16.76							1021.2	0.0	0.0	1.7
23	6	S	5	7	01	14.2	12.6	90	19.7	11.0	15.4	9.9	16.5	14.9	14.5	14.9	14.7	13.6	0	0	1	0	0.1	15.37							1023.1	0.0	0.0	1.4
24	8	SW	5	7	05	15.4	13.4	88	17.2	13.0	15.1	12.5	17.0	16.0	15.5	15.4	14.9	13.7	0	0	1	0	2.6	11.09							1017.8	3.2	0.0	1.0
25	8	N	3	7	02	11.0	8.6	85	13.0	9.8	11.4	8.8	15.5	15.0	15.7	15.3	15.0	13.8	1	1	3	0	0.0	11.58							1012.3	0.0	0.0	1.4
26	7	NW	2	8	01	10.5	5.0	69	14.5	5.5	10.0	1.4	13.5	12.2	13.0	14.8	14.9	13.9	0	0	1	0	2.3	17.13							1008.9	8.1	0.0	1.2
27	8	NE	4	6	61	8.3	6.3	87	10.4	6.2	8.3	5.0	12.2	12.3	13.2	14.6	14.8	14.0	1	3	3	0	6.6	9.13			4				1001.4	5.8	0.0	2.7
28	5	N	6	8	01	9.1	3.8	70	11.5	6.3	8.9	3.8	12.8	10.5	12.5	13.8	14.2	13.9	1	0	0	0	1.5	23.47			4				1011.9	0.2	0.0	2.6
29	6	NW	3	8	01	10.7	6.2	74	14.5	3.5	9.0	-0.5	13.6	11.0	11.9	13.8	14.0	13.8	1	2	3	0	tr	19.43							1011.9	0.0	0.0	1.5
30	8	SE	2	8	80	11.0	8.3	67	15.8	4.5	10.2	-0.6	12.5	11.6	12.0	13.7	14.0	13.8	0	0	1	0	1.5	6.69							1000	1.7	0.0	1.6
31	5	SE	2	7	01	15.8	9.3	65	17.1	10.0	13.6	7.8	15.6	13.2	12.8	13.7	13.8	13.8	1	0	0	0	4.2	12.38							1005.5	2.1	0.0	0.7
N	74	%
Means---->						11.9	8.4	79	15.3	8.3	11.8	5.9	14.4	13.0	13.3	14.1	14.1	13.3						16.63							1011
Totals----->																							72.8	515.62	0	0	2	0	1	0		83.3	0.0	50.1
MEANS AND AVERAGES AT LLANSADWRN, ANGLESEY FOR MAY 2007
Differences from 1997-2006 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					15.3	-0.4	-0.7			Sleet/ snow falling				0	-0.1			N			3					Total				72.8	101	127	%
	Mean minimum					8.3	0.1	1.3			Snow lying (at 09 GMT)				0	-0.1			NE			8					Largest fall				16.3
	Mean (max+min)/2					11.8	-0.2	0.3			Hail <5 mm				2	0.5			E			0
	Highest maximum					21.8	-1.8				Hail >=5 mm				0	{All types}			SE			2				Evaporation (mm)
	Lowest maximum					10.4	0.0				Thunder heard				0	-0.9			S			5					Lysimeter				PE	63.8
	Highest minimum					13.0	-0.1				Gales				1	n.a.			SW			9					Monthly total				PWB	9.0
	Lowest minimum					3.5	0.1				Fog (at 09 GMT)				0	n.a.			W			2									PWS	42.9
	No. days <0.0C					0	0.0			Rainfall (No. days occurrence)									NW			2									PWD	-29.4
Grass minimum mean						5.9	0.3				Dry		0.0 mm		8	-4.1			Calm			0
Lowest minimum						-0.6	-0.6				Rain		>= 0.2 mm		19	3.5											Piche (ml)				50.1
	No. days <0.0C					2	1.3				Wet		>= 1.0 mm		17	5.8			Check days			31
Earth temperature 30cm						14.1	0.5						>= 5.0 mm		3	-2.1			This month			31

Note: Any peaks seen on the PE graph are due to recent rainfalls having not yet percolated through the soil. This method is not good for daily measurements, but good results are obtained over 3 days (allowing time for percolation) and on a monthly basis. The daily graph is show here for it's interest and you can read more about this 'classic' method of measuring evaporation here

.

  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 MJ/m2 Global Solar Radiation (MJ per m2) 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 - 2007 http://www.llansadwrn-wx.co.uk