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MAY 2011 daily and monthly summary

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MAY 2011
June

Summary for May 2011
‡ 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 65% 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 2011
 
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
10.3 17.9 17.1 46 5.4 6.7 1008.5 ST 0.0 1.6 13 ENE  Sunny periods
2nd
8.8 15.6 14.8 29 -3.1 8.5 1010.2 ST 0.0 2.5 19 ENE  Sunny
3rd
4.8 15.7 15.1 25 -4.8 8.3 1016.0 ST 0.0 1.2 13 ENE  Sunny
4th
2.8 18.3 18.1 29 -0.2 8.7 1019.8 FS 0.0 0.9 14 SE  Sunny
5th
5.5 19.8 19.8 32 2.6 6.2 1017.9 FS 0.0 0.9 13 SE  Sunny pm
6th
7.0 23.9 23.8 31 5.7 8.7 1013.9 FS 0.0 1.1 16 SE  Sunny
7th
12.2 22.3 22.0 51 11.4 4.2 1010.0 FS 2.8 0.8 16 SE  Rain am
8th
14.0 19.4 17.9 58 9.6 3.7 1015.2 RS 2.5 2.3 18 SW  Rain am
9th
8.7 19.8 19.1 43 6.2 7.0 1021.2 ST 0.0 2.0 17 SW  Sunny
10th
7.9 20.3 19.1 39 4.8 8.2 1023.8 FS 0.0 1.9 14 SW  Sunny
11th
7.7 17.8 16.2 55 7.1 1.8 1021.5 FS 0.0 1.6 11 SSW  Cloudy
12th
7.8 17.8 17.2 43 4.5 4.7 1018.7 ST 0.0 2.2 18 SSW  Sunny spells
13th
5.5 17.4 16.9 45 4.9 7.8 1018.1 F 0.0 2.0 12 SSW  Sunny periods
14th
7.0 16.2 14.8 46 3.3 3.7 1018.2 ST 0.0 2.2 17 N  Cloudy
15th
7.1 15.3 14.5 39 0.7 2.2 1024.3 ST 0.0 2.1 16 N  Cloudy
16th
10.2 19.6 17.4 49 6.6 3.5 1021.2 FS 0.0 2.8 17 SSW  Cloudy
17th
9.8 17.8 17.7 54 8.2 1.3 1018.5 FS 0.0 2.6 14 SSW  Cloudy
18th
12.5 15.6 14.8 76 10.6 0.2 1013.5 FS 0.0 3.0 18 SW  Cloudy
19th
9.3 20.3 19.0 36 3.6 6.2 1016.4 FS 0.0 1.2 10 SW  Sunny spells
20th
8.6 19.3 18.4 37 3.5 6.7 1017.8 ST 0.0 1.6 14 SSW  Sunny spells
21st
6.3 20.1 19.6 44 7.0 9.0 1017.7 FS 0.0 1.8 16 SW  Sunny
22nd
10.4 18.3 15.4 60 7.7 5.5 1016.0 RS 0.8 4.2 22 SW  Sunny spells
23rd
7.7 17.9 16.9 50 6.4 6.7 1017.9 F 0.0 4.7 27 SW  Sunny spells
24th
7.1 18.4 17.9 33 1.4 9.2 1025.3 ST 0.0 3.0 19 SSW  Sunny
25th
4.8 19.8 19.5 25 -1.1 9.0 1019.7 F 0.0 1.7 17 SW  Sunny
26th
10.8 16.2 16.0 62 8.7 3.5 1005.3 RS 3.0 4.6 28 SW  Showers
27th
9.1 16.1 14.7 55 5.7 5.2 1017.7 RS 0.0 2.3 14 SW  Sunny spells
28th
8.2 14.9 13.2 71 8.0 1.5 1012.8 FS 0.0 4.5 20 SW  Cloudy
29th
12.1 18.9 17.4 62 10.0 6.2 1011.3 ST 0.0 4.8 26 SW  Sunny spells
30th
11.7 19.9 17.8 65 11.2 5.5 1008.2 FS 1.0 2.2 16 SW  Rain eve.
31st
6.6 16.3 14.5 45 2.7 4.7 1020.2 R 0.0 1.6 17 N  Sunny spells
                         
‡ 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
Slack LP 1000 hPa W of Brittany, HP 1035 hPa NW of Norway. Sunny am, cloudier pm
2nd & 3rd
Mainly sunny, on the 3rd patchy thin high cloud am clearing mid pm.
4th
HP 1024 hPa North Sea and HP to north and south, LP 990 hPa 50°N 25°W. A sunny day with just patchy thin high cloud.
5th
Overcast am, brightening pm with hazy sunshine.
6th
Sunny day, patchy high cloud and becoming more hazy pm.
7th
LP 979 hPa at 50°N 20°W, HP to N and NE. A few moderate rain showers early am to 10.00. Mainly cloudy day with some sunshine.
8th
Rain showers early am, heavy shower around 08.00. Mainly cloudy day with a few light spots of rain, some sunny intervals.
9th
Long spells of sunshine early and late, cloudy spell around midday. A light rain shower late evening.
10th
LP 1000 hPa S of Iceland, weak HP ridge from SW. Sunny periods am with cloud decreasing pm.
11th
Mainly cloudy with a long sunny spell late am. A light rain shower evening.
12th
Sunny start, mixture of sunshine and cloud later with one brief and light rain shower early pm.
13th
Sunny periods with just a few cloudy breaks.
14th
LP 1005 hPa near Shetland, HP 1035 hPa WSW of Ireland at 20°W. Mixture of cloudy and sunny spells with two brief light rain showers evening.
15th
Sunny periods am, cloudy pm.
16th
Cloudy am, some sunny spells pm.
17th
Bright start with some sunny spells, becoming cloudier from mid pm and overcast by evening.
18th
Generally cloudy or overcast with only two very brief bright spells. Some very light drizzle evening from weak cold front.
19th
Long sunny spells early am and late pm onwards, cloudier during middle of day.
20th
Cloudy start giving way to some long sunny spells after 08.00h.
21st
Mainly sunny but with a cloudy spell mid-morning.
22nd
Cold front early am brings some showery rain. Sunny spells with a couple of light rain showers pm.
23rd
Windy with sunny spells, some light rain from cold front passage late evening.
24th
LP 996 hPa W of Ireland at 20°W, HP 1031 hPa Azores to Brittany. Hazy sunshine to start, sky becoming clearer with just a few cloudy breaks.
25th
Clear and sunny start, high wispy cloud increasing through the afternoon but almost uninterrupted sunshine until evening .
26th
LP 999 hPa crosses N England. Sunny intervals / light rain showers from late morning, heavier and more prolonged shower late pm with thunder/lightning.
27th
Mainly cloudy with some sunny spells especially the evening.
28th
Cloudy / overcast day with a few brief sunny intervals.
29th
LP 990 hPa Shetland, HP 1019 hPa E Europe. Mixture of cloudy and sunny spells, cloud clearing away late evening.
30th
LP to N, NE and E, sunny spells from mid-morning to mid pm, cold front brings light rain / drizzle during evening.
31st
Sunny spells early and late, cloudier in between with two very light and brief rain showers.