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MAY 2012 daily and monthly summary

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MAY 2012
June

May 2012 Monthly stats summary
‡ SUN: Sunshine hours are calculated approximately and solely from solar radiation readings, but note that the solar sensor's exposure to sunshine is limited. The sensor receives only up to 60% of total possible sunshine exposure this month due to obstruction. There is no allowance for sunshine by visual observation only, so the sunniest day figures above can be very significantly less than the actual daily sunshine duration.
THW = Shaded Heat Index calculated with cooling/warming effect of wind and humidity to give an apparent temperature.
THSW = Unshaded Heat Index calculated with cooling/warming effect of wind, humidity and full direct sunshine to give an apparent temperature.
EVAPO-TRANSPIRATION is drying effect due to sun and wind, and is equivalent to "negative rainfall"

   DAILY STATS MAY 2012
 
TEMPERATURE ºc
HUMIDITY
SUN ‡
PRESSURE
RAINFALL
WIND SPEED
DIRECTION
 WEATHER
 NOTES
DATE
Low
(21-09h)
High
(09-21h)
Temp at 14.00z
RH %
at 14.00z
Dewpoint ºc
at 14.00z
Bright
sun hrs
hPa   †
at 14.00z
Day Total
(mm)
Average
(mph)
Max Gust
(mph)
Dominant
(Compass)
 Precipitation
 type etc ‡
                       
1st
10.8 17.3 15.6 68 9.7 5.3 1015.9 R 5.8 1.3 13 SW  Rain am
2nd
9.5 13.1 10.7 80 7.4 0.0 1016.9 FS 0.3 2.1 17 N  Rain night pm
3rd
7.9 9.1 8.8 89 7.1 0.0 1009.2 FS 5.1 0.7 10 N  Rain am
4th
7.0 9.8 9.1 78 5.5 0.2 1004.3 FS 0.0 1.0 11 N  Overcast
5th
5.4 9.6 9.2 66 3.1 0.2 1008.2 ST 1.8 1.9 16 N  Rain am
6th
5.1 7.6 6.9 81 3.9 0.0 1013.0 RS 2.8 1.2 11 N  Rain am, eve.
7th
4.9 14.1 11.1 81 7.9 2.0 1012.2 FS 1.5 1.5 18 SW  Rain night pm
8th
10.1 16.7 15.1 81 11.8 2.8 1005.3 ST 6.1 1.3 14 SW  Rain am
9th
10.7 15.2 14.8 86 12.5 0.1 1008.6 RS 4.6 2.4 17 SW  Rain eve & night
10th
13.9 16.9 16.1 88 14.1 0.2 1009.2 ST 10.7 6.0 22 SW  Rain
11th
11.1 16.8 16.3 49 5.5 6.5 1022.1 R 0.0 3.7 19 SW  Sunny periods
12th
5.3 16.6 14.8 39 0.9 4.8 1036.3 ST 0.0 1.6 13 N  Sunny spells
13th
3.4 16.3 14.7 47 3.5 5.3 1027.7 F 0.0 2.3 17 SW  Sunny periods
14th
7.1 13.1 10.2 84 7.6 1.0 1014.3 FS 3.3 3.5 18 SW  Rain pm
15th
4.6 12.6 9.1 72 4.3 4.5 1013.9 R 2.8 2.4 20 N  Rain showers
16th
3.8 14.5 13.6 41 0.5 4.3 1024.3 FS 0.3 1.8 14 SW  Sunny spells
17th
6.6 15.3 14.5 46 3.0 2.3 1013.9 F 0.0 0.8 12 SE  Cloudy
18th
7.6 16.1 13.6 81 10.4 0.1 1002.5 RS 0.3 1.3 12 SW  Drizzle pm/eve.
19th
10.4 19.1 18.4 44 6.0 2.7 1008.2 FS 0.0 1.7 12 SW  Sunny spells
20th
8.8 15.7 14.7 66 8.4 1.2 1007.5 FS 0.3 2.6 14 N  Cloudy
21st
8.9 15.9 15.2 69 9.5 5.5 1006.9 ST 0.0 3.3 17 N  Sunny spells
22nd
11.3 24.9 24.4 54 14.5 9.0 1013.0 RS 0.0 2.6 16 N  Sunny
23rd
13.7 27.1 25.7 49 14.2 9.2 1021.0 RS 0.0 0.8 10 N  Sunny
24th
14.1 27.1 26.6 52 15.9 9.0 1024.1 FS 0.0 0.4 10 N  Sunny
25th
13.9 25.8 25.1 39 10.2 9.2 1020.9 FS 0.0 0.9 11 ENE  Sunny
26th
12.6 26.2 25.1 29 5.8 9.2 1017.3 FS 0.0 1.0 19 ENE  Sunny
27th
12.2 28.3 28.2 27 7.4 9.2 1016.2 FS 0.0 0.6 12 SE  Sunny
28th
11.7 26.0 25.7 43 12.2 9.2 1015.6 FS 0.0 1.0 11 N  Sunny
29th
14.2 25.3 25.0 48 13.2 5.2 1014.9 FS 0.0 1.0 11 SE  Sunny am
30th
11.6 23.9 23.8 47 11.8 8.0 1016.6 FS 0.0 1.2 12 SSW  Sunny periods
31st
12.1 20.1 19.4 60 11.5 3.0 1016.3 FS 0.0 2 16 SSW  Cloudy
                         
‡ SUN: Sunshine hours are calculated approximately and solely from solar radiation readings, but note that the solar sensor's exposure to sunshine is rather limited. The sensor receives less than 25% of total possible sunshine exposure this month, and there is no allowance for sunshine by visual observation only, so the figures above can be very significantly less than the actual daily sunshine duration.
† Barometer trend (previous 3 hours) : F = falling, ST = steady, R = rising; Q = quickly, S = slowly
Weather Notes use METAR codes: OVC = overcast; SHRA = rain showers; '+' = heavy; CAVOK = no cloud below 5000 ft & visibility> 10 km & no fog, precipitation or snow; SN = snow; RASN = Rain and snow

1st
HP 1030 hPa Shetland, LP 998 hPa far to WSW of Cornwall at 13°W.
Spell of moderate/heavy rain from 04.00 to 06.30 from occlusion. Dull morning brightens to give some long sunny spells in the afternoon.
2nd
An overcast day, mainly rather dull. Spell of light rain early evening
3rd
Some heavy rain showers before and around dawn. Staying overcast and mostly dull with occasional light drizzle.
4th
Another overcast and mainly dull day with just a brief moment of brightness in the morning.
5th
Rain from around 05.00 to 07.30. Another overcast day but less dull and with some brightness in the afternoon.
6th
Light rain and drizzle from around 04.00 to 08.30. Yet another overcast day with only the briefest hint of brightness. More drizzle evening. New site record for lowest daytime maximum temperature in May.
7th
LP 1003 hPa W of Ireland.
A bright start with sunny spells, becoming cloudy with a short spell of light rain afternoon from warm front. Bright end to the day. More rain after dark.
8th
Rain showers, some heavy, through the night. Becoming drier after 08.00. Staying overcast with more light rain around 13.00. Sunny spells later.
9th
Rain shower just after midnight, another overcast day with only brief brightness. Drizzle and then rain from early evening.
10th
Showery rain overnight with some heavy bursts to 07.00.Remaining overcast with another spell of rain in the afternoon.
11th
HP 1036 hPa to W of Ireland, LP 1000 hPa S Norway.
Mainly cloudy morning with sunny intervals, longer sunny spells in the afternoon.
12 & 13th
A clear start becoming more cloudy by mid-morning with sunny intervals, some longer sunny spells in the afternoon.
14th
A sunny start becoming more cloudy by 10.00am as cold front approaches which gives spell of rain in the afternoon.
15th
LP 983 hPa Norwegian Sea. Sunny very early but rain from 09.00 to 10.00 and temperature falls sharply. Sunshine and showers in the afternoon and evening, with a cool breeze.
16th
A light rain shower in the night. Sunny until 09.30 then increasing cloud again giving sunny intervals through the day.
17th
Rather cloudy day but sometimes bright with some hazy sunshine in the afternoon. Brief spell of drizzle early evening.
18th
Sunny early morning but becoming increasingly cloudy. Overcast afternoon and evening with intermittent light drizzle.
19th
Another day dominated by cloud but with a couple of long sunny spells one morning and one afternoon.
20th
A little drizzle early morning. Yet another day dominated by cloud but with a brief sunny spell in the afternoon.
21st
UK lies in a col; with LP roughly to E & W, HP to N & SSW
A cloudy but fair morning with cloud thinning to give spells of sunshine above all after midday.
22nd
Cloudy though bright start with strong haze. Clearing to give long sunny periods.
23rd
Sunny though hazy start, some patchy high cloud in the middle of the day briefly interrupting the sunshine, hazy end to the day.
24th
Mist, low cloud clears in midmorning to give a day of hazy sunshine.
25th
HP 1035 N of Shetland, LP 1007 hPa Northern Spain.
A day of uninterrupted sunshine with clear skies and no haze this time.
26th
Another day of uninterrupted sunshine, clear skies and breezy.
27th
HP 1030 hPa S Norway/Sweden, LP 1006 hPa between Azores and UK.
An almost uninterrupted day of sunshine with just a little patchy cloud in the middle of the day.
28th
Another day of near almost uninterrupted day of sunshine. Just a little patchy cloud in the afternoon although there was thunderstorm to the east.
29th
A sunny morning but cloud increases in the afternoon, and overcast from late afternoon onwards.
30th
Low cloud burns away in mid-morning to give long sunny periods.
31st
A few bright spells but mainly cloudy.