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APRIL 2011 daily and monthly summary

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APRIL 2011
May


April 2011 monthly 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 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 APRIL 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
10.4 15.8 14.7 70 9.3 3.2 1017.5 FS 0.0 4.1 24 SW  Sunny spells pm
2nd
10.8 19.1 18.2 60 10.3 5.3 1007.4 ST 0.0 2.4 17 SW  Sunny spells
3rd
5.2 14.7 13.4 62 6.3 6.2 1013.1 ST 0.0 2.2 17 SW  Sunny periods
4th
5.8 12.7 12.3 53 3.0 5.7 1021.1 ST 0.0 3.3 20 SW  Sunny periods
5th
8.2 10.9 10.6 84 8.0 0.0 1021.1 RS 0.8 4.9 20 SW  Rain am
6th
10.4 21.4 20.6 39 6.2 8.8 1024.9 FS 0.0 2.3 14 SW  Sunny
7th
6.3 22.2 21.5 46 9.4 8.7 1026.1 FS 0.0 1.0 12 N  Sunny
8th
8.8 22.7 22.4 30 4.0 8.7 1024.6 FS 0.0 0.4 8 N  Sunny
9th
5.7 18.5 17.9 47 6.4 8.7 1024.0 FS 0.0 0.6 14 SE  Sunny
10th
5.4 22.1 21.8 32 4.3 8.7 1022.1 FS 0.0 0.4 8 WNW  Sunny
11th
5.2 20.8 20.6 46 8.5 6.0 1018.7 FS 0.0 1.6 18 N  Sunny periods
12th
5.7 13.9 12.5 36 -2.2 6.7 1028.4 FS 0.0 1.9 17 N  Sunny periods
13th
2.5 12.7 11.3 54 2.3 2.0 1020.1 F 0.0 1.7 16 SSW  Cloudy
14th
6.5 13.2 12.9 51 3.0 3.3 1017.1 FS 0.0 0.9 12 SSW  Cloudy
15th
8.3 15.2 14.5 47 3.3 2.2 1018.8 FS 0.0 0.3 7 SSW  Cloudy
16th
8.1 17.3 16.8 40 3.1 5.5 1021.0 ST 0.0 0.5 8 SSW  Sunny spells
17th
6.4 20.6 18.9 45 6.7 5.5 1022.4 FS 0.0 0.4 11 SE  Sunny spells
18th
6.6 20.3 20.1 27 0.5 7.2 1014.5 F 0.0 0.7 13 SE  Sunny periods
19th
7.4 24.8 24.4 32 6.7 8.5 1011.1 ST 0.0 0.7 12 SE  Sunny
20th
8.3 27.7 25.1 26 4.2 6.7 1012.2 FS 0.0 0.4 10 SE  Sunny periods
21st
10.9 26.6 25.7 24 3.6 8.3 1010.5 FS 0.0 0.5 13 SE  Sunny
22nd
8.2 26.2 25.4 26 4.5 8.8 1006.1 FS 0.0 0.7 13 SE  Sunny
23rd
9.1 28.7 28.6 25 6.6 5.2 1010.0 ST 0.3 0.3 11 N  Sunny, thunder pm
24th
9.1 25.9 25.8 36 9.6 8.7 1016.8 ST 0.0 0.6 10 N  Sunny
25th
9.6 21.2 20.9 43 7.9 8.7 1020.4 FS 0.0 2.1 19 N  Sunny
26th
8.1 17.5 16.8 52 6.9 7.2 1022.5 FS 0.0 2.1 14 N  Sunny periods pm
27th
7.8 17.7 16.7 41 3.3 8.0 1022.4 FS 0.0 1.8 14 N  Sunny periods pm
28th
5.6 16.8 14.4 60 6.8 3.7 1015.2 F 0.0 2.5 16 N  Cloudy
29th
8.5 18.7 17.8 60 10.0 6.7 1009.4 FS 0.0 1.2 14 N  Sunny spells pm
30th
10.1 18.2 17.7 50 7.1 8.5 1006.9 FS 0.0 1.3 16 SW  Sunny
                         
‡ 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 1028 hPa Switzerland, LP to far NW and NE. Overcast until early pm then sunny spells.
2nd & 3rd
Sunny start, cloudier from midmorning with sunny intervals pm.
4th
HP 1026 hPa Biscay, LP 986 hPa NE of Faroe Islands. Sunny am with a band of cloud crossing during middle of day, sunny spells later.
5th
HP 1029 hPa C France, LP 973 hPa N of Faroe Islands. Light rain early am, remaining overcast all day.
6th & 7th
Sunny days with patchy thin high cloud.
8th
HP 1027 hPa UK. Sunny and cloudless day.
9th
Sunny day with a little patchy cloud late pm.
10th
Sunny day with some high cloud lasting most of the day.
11th
HP 1039 hPa WSW of UK at 20°W. Mainly sunny day with early haze, cold front crosses late pm giving cloudy spell and a few spots of rain.
12th
Long sunny periods interrupted by cumulus clouds am & pm.
13th
Mainly cloudy with some brighter spells am and pm.
14th
Mainly cloudy, a light rain shower am with some brighter spells middle of the day.
15 - 17th
Mainly cloudy but with some long sunny spells.
18th
Long sunny periods, cloudy spell middle of day.
19th
Sunny day with just occasional small patches of cloud.
20th
New site record for high April temperature. Sunny periods mainly in the morning, more cloud pm.
21st
HP 1025 hPa SE Europe, LPs 1001-1005 hPa Iberia. Long sunny periods with some cloud building up pm.
22nd
Uninterrupted sunshine although a little hazy.
23rd
Sunny and clear to mid pm, thunderstorm close by at 17.00h, light rain with hail mixed in. April high temperature record of the 20th beaten.
24th
Sunny but rather hazy most of the day.
25th
HP 1030 hPa mid Atlantic to W of Ireland, HP S and E Europe, LP W of Iceland and N Africa. Another sunny day.
26 & 27th
Cloudy early/mid am, sunny periods pm.
28th
Mainly cloudy with some sunny spells especially pm.
29th
Overcast am, brightening to give spells of hazy sunshine.
30th
Almost uninterrupted sunshine with mainly clear skies although a little hazy.