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APRIL 2012 daily and monthly summary

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APRIL 2012
May

April 2012 monthly summary stats
‡ 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 APRIL 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
1.2 13.6 13.3 38 -0.8 7.8 1017.5 F 0.0 0.6 11 N  Sunny periods
2nd
1.1 15.9 15.4 29 -2.6 7.8 1006.9 F 0.0 0.5 10 N  Sunny periods
3rd
3.0 14.1 13.7 46 2.3 3.3 1000.1 FS 1.5 0.9 13 SSW  Rain showers eve
4th
3.2 11.0 9.3 54 1.0 1.7 1006.9 RS 0.5 0.6 10 SSW  Rain night am
5th
4.9 8.7 6.9 68 1.4 2.8 1018.0 ST 0.0 1.5 13 NE  Cloudy
6th
-0.8 13.1 12.9 32 -3.4 6.7 1011.6 F 0.0 1.0 16 N  Sunny
7th
7.0 10.3 10.3 60 2.9 0.1 1010.8 ST 0.0 0.7 10 N  Cloudy
8th
4.3 12.5 11.5 75 7.2 0.2 1010.2 FS 0.3 1.5 17 SSW  Light rain am
9th
7.9 9.6 9.3 87 7.2 0.0 993.8 F 7.4 5.6 27 SW  Rain
10th
5.6 13.4 13.0 48 2.2 6.5 988.9 ST 0.3 3.8 22 SW  Sunny spells
11th
1.7 12.3 11.3 60 3.8 3.7 995.7 RS 1.5 1.1 13 SW  Rain showers
12th
2.1 12.7 12.4 49 2.0 3.3 1001.2 ST 4.6 0.7 17 SSW  Rain shower
13th
-0.1 14.0 13.3 55 4.4 5.5 1003.2 FS 0.0 0.4 10 N  Fog am.
14th
3.6 13.6 12.2 41 -0.7 4.7 1006.0 ST 0.5 1.1 13 N  Rain shwr night pm
15th
2.5 9.8 8.6 45 -2.7 5.2 1018.5 RS 0.3 3.6 20 N  Rain shower pm
16th
0.7 12.2 10.3 34 -4.9 4.3 1023.0 F 0.0 1.3 13 N  Sunny spells
17th
3.2 14.1 13.2 43 0.9 5.2 996.1 F 4.1 4.0 24 SW  Shower pm
18th
5.1 9.9 9.6 79 6.1 1.2 977.4 F 11.9 3.9 27 SW  Rain
19th
5.9 10.4 8.2 81 5.2 1.5 984.6 R 7.6 2.6 16 SSW  Rain showers
20th
4.5 13.3 11.3 62 4.3 5.0 992.3 RS 1.0 2.0 20 SSW  Rain showers
21st
4.2 13.2 12.4 44 0.5 5.3 995.7 RS 0.3 1.9 17 SSW  Sunny spells
22nd
4.3 14.9 12.2 64 5.6 4.8 1000.8 FS 0.8 2.9 20 SW  Rain showers
23rd
5.8 9.4 7.6 85 5.2 0.2 989.0 F 5.8 1.8 18 SE  Rain
24th
6.1 13.2 11.4 61 4.1 3.2 997.2 R 0.8 2.9 17 N  Drizzle am
25th
5.8 12.4 11.7 81 8.5 0.7 983.1 F 23.9 3.6 32 SW  Rain
26th
7.9 13.2 12.6 60 5.1 3.0 997.2 R 6.6 6.8 29 SW  Rain showers am
27th
8.7 15.4 15.2 50 4.8 5.2 1010.8 RS 0.0 3.8 20 SW  Sunny spells
28th
8.6 9.2 8.3 85 5.9 0.0 1012.9 FS 8.9 2.1 19 N  Rain
29th
5.9 15.5 13.6 87 11.4 5.2 1000.4 RS 12.2 2.9 31 SE  Rain am
30th
7.9 20.0 19.8 43 6.8 7.2 1012.1 ST 1.0 2.0 20 SE  Rain night pm
                         
‡ 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 1024 hPa Mid Atlantic, LP 988 hPa Central Sweden/Norway.
Sunny spells in the early morning, scattered clouds clear away to give long sunny periods in the afternoon.
2nd
Slightly hazy sunshine at first, becoming clearer in midmorning but with patchy cloud from late afternoon.
3rd
LP 999 hPa NE England.
Sunny spells morning and early afternoon. Cloudier with rain showers later from cold front passage early evening and night.
4th
Some light rain in the night, sunny morning but cloudier from late morning with a brief light rain shower in mid afternoon and sunny intervals.
5th
Overcast and dull morning brightening in mid afternoon and sunny spells from 16.00.
6th
Uninterrupted sunshine until cloud increases around 17.00.
7th
A cloudy day, often overcast and dull with just a brief moment of morning brightness.
8th
HP 1032 hPa N of Azores, LP 984 hPa Iceland, LpP 999 hPa Adriatic Sea.
Dull and overcast to mid morning with some drizzle. A short brighter spell but becoming overcast again.
9th
LP 977 hPa near Faroe Islands.
Overcast with light rain after 07.30 from passage of various fronts associated with the LP, heavier rain through early night.
10th
Light rain continues from previous day. Sunny morning, cloud increases to give a couple of brief light showers but sunny spells prevail.
11th
A day of sunhine and frequent, mainly light rain showers with one thundery in the afternoon. A light rain shower around 22.00.
12th
Bright morning with sunny spells into early afternoon. Heavy rain shower with some hail at 15.30.
13th
A foggy start, clearing by 10.00 but cloudy. Cloud breaks after 11.30 to give sunny spells.
14th
LP 1003 hPa between Denmark/Norway, LP 1002 hPa Biscay, LP 985 hPa Italy, HP 1027 hPa north of Iceland.
A rather cloudy day but often bright with some sunny spells. Rain shower around 22.00.
15th
Sunny start with increasing cloud from mid-morning. Sunny spells with a couple of light rain showers and a little hail late afternoon.
16th
Sunny start with increasing cloud from mid-morning. Sunny spells but feeling fresh.
17th
LP 969 hPa SSE of Iceland, W of N Scotland.
Rain from 08.00 to just after 11.00. Hail shower around 16.30 and another light rain shower later.
18th
LP 975 hPa south central England.
Rain in the morning followed by a drier and brighter spell, with more outbreaks of rain in the afternoon and evening.
19th
LP 982 hPa Lincs/Norfolk.
Overcast morning. A little sunshine with frequent showers in the afternoon, one with very heavy rain and thunder, lighter showers by nighttime.
20th
LP 989 hPa Off Northumberland coast.
Sunny start becoming cloudier with a heavy rain/hail shower around 13.00. Sunny spells pm.
21st
Rain shower around dawn, sunny spells through the day.
22nd
Sunny spells with a brief heavy rain shower afternoon and a lighter one in the late evening.
23rd
LP 984 hPa S of Cornwall.
Sunny start, clouding over after 09.00 with rain from 10.30 becoming more drizzly by 18.00h and into the night.
24th
Chilly and dank morning with outbreaks of drizzle. Brightening up in mid-afternoon.
25th
LP 972 hPa Scilly. Moderate rain from 06.00 to midday. Brightening to give brief sunny glimpses but also very heavy rain showers, some with hail. Long spell of rain evening into the night.
26th
LP 984 hPa Wales. Rain showers continue overnight, one heavy around dawn. Cloudy with further showers through the morning. Brighter afternoon.
27th
Cloudy morning with sunny intervals, sunny spells afternoon.
28th
LP 1009 hPa Central France. Spell of rain from 05.00 to 07.30 followed by further outbreaks of rain in the morning. Long spell of rain from late afternoon.
29th
LP 988 hPa N Brittany. Persistent light/moderate rain continues overnight until around 13.00. Sky clears to give sunny spells pm.
30th
LP 996 hPa WSW of Scilly. Long sunny periods morning to mid-afternoon. Rain showers after dark.