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APRIL 2013 daily and monthly summary

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APRIL 2013
May

April 2013 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 less than 65% of total possible sunshine exposure this month due to low sun altitude and 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 2013
 
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 0.2 6.7 6.5 44 -4.9 5.3 1010.0 FS 0.0 1.1 13 ENE  Sunny periods pm
2nd 0.0 7.8 7.6 36 -6.6 6.8 1013.9 RS 0.0 2.3 20 NE  Sunny periods
3rd 0.2 3.5 2.8 62 -3.7 0.1 1015.8 FS 0.0 2.7 17 NE  Overcast
4th 1.0 2.8 1.3 86 -0.8 0.2 1011.8 FS 1.3 2.4 17 N  Snow
5th 1.1 5.2 4.8 58 -2.8 0.0 1014.5 RS 0.3 3.1 19 N  Drizzle am
6th -0.9 10.8 10.3 36 -4.2 6.8 1023.5 ST 0.0 1.3 14 N  Sunny periods
7th -2.9 11.2 10.4 35 -4.4 8.0 1017.4 F 0.0 0.6 11 SE  Sunny
8th 2.8 12.5 12.2 31 -4.4 5.3 1002.6 FS 0.0 0.8 13 ENE  Sunny periods pm
9th 3.6 7.5 7.3 83 4.6 0.0 995.4 RS 2.5 0.5 11 ENE  Rain
10th 3.2 9.7 9.6 66 3.6 1.2 1003.7 FS 6.6 1.2 14 SE  Rain
11th 5.8 12.0 9.2 86 7.0 2.2 997.1 FS 2.5 1.1 12 SSW  Rain am
12th 7.1 10.6 9.9 86 7.7 1.2 995.9 R 7.6 3.0 19 SSW  Rain showers
13th 4.9 11.6 9.6 86 7.4 0.2 1011.0 FS 6.3 3.2 25 SW  Rain pm
14th 10.4 21.3 21.0 46 8.9 6.3 1011.6 FS 0.3 4.7 24 SW  Sunny periods
15th 9.9 16.3 16.1 55 7.1 5.3 1017.1 ST 0.0 4.2 22 SW  Sunny spells
16th 8.8 15.3 14.1 62 6.9 6.5 1015.0 ST 0.3 5.0 22 SW  Sunny periods pm
17th 9.7 18.9 17.1 58 8.8 4.3 1012.4 F 0.3 3.9 21 SW  Sunny spells pm
18th 8.8 13.7 12.4 60 4.9 3.8 1013.6 RS 1.3 6.8 27 SW  Rain showers pm
19th 6.2 11.9 11.6 53 2.3 1.2 1026.0 RS 0.5 2.3 17 N  Rain shower am
20th 0.9 14.6 14.3 39 0.5 8.8 1030.1 FS 0.0 0.6 13 NE  Sunny
21st -0.4 15.7 14.8 31 -2.2 6.3 1016.6 F 0.0 1.4 16 SSW  Sunny
22nd 5.7 14.7 13.3 54 4.2 3.2 1014.2 FS 0.0 2.8 18 SSW  Sunny spells am
23rd 9.4 21.2 20.9 41 7.1 8.7 1018.6 ST 0.0 2.0 12 SSW  Sunny
24th 7.6 17.6 16.9 64 10.0 3.8 1022.3 ST 0.0 1.7 14 SSW  Cloudy
25th 10.6 23.0 22.7 44 9.8 8.7 1017.7 F 0.0 2.0 22 SSW  Sunny
26th 6.4 12.4 11.0 59 3.3 1.5 1012.1 F 5.1 1.8 18 N  Rain am
27th 2.4 12.5 12.5 43 0.2 3.5 1012.8 ST 0.0 1.4 18 N  Sunny spells pm
28th 0.4 13.8 12.4 47 1.4 6.2 1014.0 F 0.0 2.4 18 SSW  Sunny periods
29th 7.2 14.1 12.9 42 0.3 5.8 1016.4 RS 0.3 2.9 19 SSW  Sunny periods
30th 5.0 16.2 14.7 36 -0.2 8.2 1022.7 FS 0.0 1.5 13 NE  Sunny periods
                         
‡ 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 65% 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 1020 hPa Shetland, LP 974 hPa at 50°N 20°W. Overcast and dull start, gradually brightening to give some sunny periods in the afternoon.
2nd
Clear and sunny start with a couldy spell in mid-morning. Long sunny periods developing again in the afternoon. Notable wind chill.
3rd
Bright with sunshine first thing but quickly becoming cloudy then overcast. Some light flurries of snow in the afternoon.
4th
Overcast with more or less persistent snowfall from a trough from 09.30 to 15.00. Snowfall is mainly light but sometimes heavier and enough to give a light dusting for about an hour after midday. The COLDEST APRIL DAY in my site records and made worse by a windchill. Some brief brightness late afternoon.
5th
Very gloomy morning with drizzle, becoming drier and a little brighter by lunchtime but staying cloudy.
6th
Bright and sunny start but clouding over in mid morning. Some long sunny periods develop after midday.
7th
HP 1022 hPa Belgium, LP 990 hPa SSW of Ireland. Ground frost, a sunny day with thin high cloud, sunshine becomes more hazy as the day goes on.
8th
Cloudy but bright with periods of hazy sunshine from late morning.
9th
LP 984 hPa S of Ireland and W of Cornwall. An overcast day with rain in the morning easing to light drizzle around lunchtime. A further spell of rain late in the night.
10th
A little rain continues from the previous day. A cloudy but sometimes bright day with a brief spell of hazy sunshine in late morning. A new band of rain arrives in early evening.
11th
The spell of rain continues from the previous night. A spell of drizzle end before 08.00 leaving a cloudy and murky morning. Slowly brightening through the afternoon with some sunny spells late afternoon/early evening.
12th
LP 990 hPa filling slightly and tracking E across S England. Overnight rain showers, a cloudy morning with some intermittent rain, Heavier rain showers in the afternoon and a few sunny intervals mainly in late afternoon/early evening.
13th
Cloud breaks early to give a long sunny spell in midmorning. Clouding over again with persistent rain from 14.00 lasting the rest of the day and night.
14th
Cloudy start with some light rain showers. Cloud breaks in mid morning to give some sunny periods, a warm but windy afternoon.
15th
A mixture of cloudy and sunny spells through the day.
16th
Overcast with drizzle in early morning. Sky brightens and clears slowly to give some sunny periods in the afternoon and evening .
17th
Overcast with intermittent light drizzle to mid morning. Cloud break in early afternoon to give some long but sometimes hazy sunny spells.
18th
Mainly cloudy and windy day with some sunny spells, a couple of heavy rain showers in late afternoon.
19th
Mainly cloudy day with a rain shower in mid morning. A few brief sunny intervals around midday and a longer spell in the evening.
20th
HP 1034 hPa S England. Early mistiness clears slowly through mid morning. Sky clears of cloud and sunshine becomes uninterrupted after around 10.00.
21st
A sunny day with some thin high cloud which increases during the afternoon as a decaying front approaches from the west. Mainly cloudy after 16.00.
22nd
Overcast start with cloud breaking in the morning to give some sunny spells. Clouding over from mid-afternoon onwards.
23rd
Partly cloudy in early morning, cloud clears after 09.00 to give uninterrupted sunshine for the rest of the day.
24th
Bright start but cloud moves in from the west. Some further short sunny spells in the morning and afternoon but clouding over later.
25th
Bright with much high cloud to start. Gradually clearing to give a sunny day with a little haze and just a few patches of cloud now and then.
26th
LP 1008 hPa Shetland and 1011 hPa Belgium. Cold front passage brings moderate rain for most of the morning. Rain showers and a few sunny intervals in the afternoon.
27th
A cloudy morning with little sunshine. Some sunny spells in the afternoon missing the showers which pass close to our west.
28th
Sunny and clear morning but high cloud encroaches from the north west. Some sunny spells in the afternoon.
29th
Drizzle in the night, cloud clears around 08.00 to give long sunny periods. More cloud in the afternoon but breaks to give sunny intervals and spells.
30th
A day of sunny periods: some long and sometimes hazy, with variable amounts of high and mid level cloud through the day.