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MARCH 2013 daily and monthly summary

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MARCH 2013
April

March 2013 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 MARCH 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
2.8 6.7 6.3 64 -0.0 0.3 1028.4 ST 0.3 1.3 13 N  Drizzle am
2nd
2.4 5.7 5.1 65 -0.9 0.3 1026.1 F 0.0 0.6 10 N  Cloudy
3rd
1.2 7.9 7.2 69 1.9 1.0 1022.0 FS 0.0 0.5 12 SE  Fair
4th
-0.9 12.3 12.2 46 0.9 7.2 1010.4 F 0.3 0.6 14 SE  Sunny
5th
0.3 16.8 16.6 47 5.2 7.2 1002.8 F 0.0 0.4 12 SE  Sunny
6th
6.8 14.7 14.3 58 6.1 1.0 999.3 FS 0.0 0.1 6 SE  Cloudy
7th
7.5 10.8 10.7 88 8.8 0.0 994.8 FS 2.3 0.1 7 SE  Rain/Drizzle
8th
8.4 9.6 9.1 93 8.0 0.0 997.0 RS 12.7 0.0 5 N  Rain
9th
6.4 8.1 7.8 89 6.1 0.0 1001.7 ST 0.5 1.1 10 N  Rain night am
10th
2.4 3.6 2.8 84 0.3 0.0 1004.8 ST 0.0 2.0 13 N  Snow shwrs night pm
11th
-0.7 1.2 0.1 71 -4.5 0.0 1005.6 ST 3.0 3.6 19 NE  Snow
12th
-2.9 3.3 3.2 54 -5.7 4.2 1007.8 ST 1.8 3.3 12 N  Snow am
13th
0.5 5.9 5.6 58 -2.1 2.8 1009.2 ST 0.5 2.3 17 N  Showers pm
14th
-1.6 6.9 6.5 49 -3.5 4.8 1015.0 FS 0.3 0.8 12 N  Sunny
15th
1.4 6.8 6.4 81 3.4 0.0 1006.9 F 2.0 4.5 20 SW  Rain
16th
5.6 6.1 5.6 87 3.6 0.0 995.4 FS 6.1 5.2 30 SW  Rain
17th
4.4 6.7 6.3 88 4.5 0.3 987.5 F 3.8 1.5 14 SE  Rain showers
18th
-0.7 6.6 6.1 84 3.6 0.3 989.5 RS 5.8 0.2 7 ENE  Rain
19th
3.4 8.6 6.1 84 3.6 1.7 997.8 ST 1.0 0.2 7 SE  Rain am
20th
1.7 8.7 4.9 80 1.8 0.5 1007.8 R 0.0 0.5 8 N  Cloudy
21st
-0.7 6.7 6.6 62 -0.2 1.7 1015.3 FS 0.0 1.5 18 SE  Cloudy
22nd
2.1 8.4 7.9 63 1.3 1.7 1006.8 F 3.3 1.9 17 E  Rain pm
23rd
0.7 1.7 1.7 89 0.0 0.0 1009.1 ST 2.8 1.3 10 E  Snow
24th
-0.4 1.5 -0.3 82 -3.0 0.0 1011.6 ST 0.3 1.7 12 E  Snow night am
25th
0.5 1.9 1.0 66 -4.6 0.0 1012.7 FS 0.0 1.3 10 NE  Overcast
26th
0.7 1.6 1.5 62 -5.0 0.0 1012.2 ST 0.0 1.3 13 NE  Overcast
27th
0.0 6.1 5.4 49 -4.5 4.5 1010.0 ST 0.0 1.1 13 N  Sunny spells
28th
-1.6 4.7 4.3 50 -5.2 1.3 1011.2 RS 0.0 1.2 12 N  Cloudy
29th
-1.2 7.2 6.9 41 -5.5 4.2 1008.9 FS 0.0 1.0 14 NE  Sunny spells
30th
0.5 6.5 3.9 62 -2.7 1.7 1010.6 RS 0.0 1.3 12 NE  Cloudy
31st
-2.4 4.9 4.4 56 -3.6 1.2 1013.5 FS 0.0 0.5 11 NE  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 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 1036 hPa W of Ireland. A spell of drizzle in the morning. Cloud breaks to give a few sunny intervals in early afternoon.
2nd
A cloudy day but with some bright or sunny intervals in late afternoon as sky slowly clears.
3rd
As the previous day, cloudy but with some bright or sunny intervals in late afternoon as sky slowly clears.
4th
After a ground frost, a sunny day with just patches of thin high cloud causing a slight haze.
5th
A slight ground frost, a sunny day with just patches of thin high cloud and slight haze in the morning but a clear afternoon.
6th
A cloudy day with a couple of short brighter/sunnier spells.
7th
LP 978 hPa SW of Ireland. Rain and drizzle in the night, a cloudy day with further drizzle in the morning and afternoon separated by a slightly brighter dry spell.
8th
Dull and rainy all day with lighter rain first thing, becoming moderate in the afternoon and evening. Lighter again in the night.
9th
Light rain clears in the early hours, another overcast day with no cloud breaks or real brightness.
10th
Overcast day and mainly dull with some light snow showers late evening and night.
11th
LP 988 hPa WSW of Brittany. Outbreaks of light/moderate snow feeding in from the NE in the morning, settling and drifting in a strong breeze. A dry slot in the middle of the day, then heavier and more persistent snow in late afternoon and early evening leaves around 3cm snow cover. All this accompanied by a strong windchill. Further moderate snowfalls into the night giving 4 - 5cm by midnight.
12th
Snowfall eases in the night but the "snow train" returns around 07.00. Some moderate/heavy spells of snow, again driven by a strong cold wind adds about another 3cm giving a total of around 8cm level snow where sheltered from the wind. Snowfall clears fairly quickly around 11.30 and the afternoon is mainly sunny, giving a steady thaw. By evening remaining coverage of snow is quite patchy due to melting and drifting.
13th
Cloudy but bright to start , some long sunny spells developing but a couple of rain and snow showers later in the afternoon.
14th
Long sunny periods in the morning after heavy ground frost. Becoming more cloudy in the afternoon. Precipitation from frostmelt.
15th
LP 987 hPa S of Iceland and W of Scotland. Some light rain in the morning, the day stays overcast and sometimes dull with drizzle returning in late afternoon becoming heavier in the evening.
16th
Overcast and mainly dull with outbreaks of rain in the morning and early afternoon.
17th
LP 987 hPa S England. Mainly overcast or cloudy with some rain showers and just a brief moment of sunshine. Heavier band of rain during the evening as wrap-around occlusion passes.
18th
Bright early with some sunny intervals. Increasingly cloudy from late morning with showers merging into a long spell of rain in the afternoon and evening.
19th
Rain and drizzle in the early morning. Staying overcast until mid afternoon when cloud clears somewhat to allow some long sunny spells.
20th
Cloudy morning with a short sunny spell before noon. Becoming overcast but slightly brighter briefly in the afternoon before overcast returns.
21st
Hazy sunshine until mid morning, becoming cloudy but staying fairly bright until mid afternoon.
22nd
Light rain for around three hours after midnight. Cloudy but bright day with some breaks giving a couple of short spells of weak sunshine. Bands of rain arrive starting late afternoon and into the night.
23rd
Rain turns to snow in early morning. Light snow in the morning gives a slight dusting on some surfaces which melts away quickly, gradually easing off by early afternoon.
24th
LP 991 hPa at 50N 20W, HP 1040 hPa between Iceland and Norway. Temperature falls from 1.3 °C at midnight to below zero just after 06.00. Some light snow around dawn gives a light dusting on some surfaces. A very cold day for late March, temperature stays below freezing until late afternoon.
25 & 26th
Cloudy and mainly dull days. Sky clears a little on both days just before sunset.
27th
A bright day with some long sunny spells morning and afternoon.
28th
A fair morning with sunny spells, becoming more cloudy after 09.30 but with a few sunny intervals.
29th
Cloudy but fair morning with sunny spells developing, especially in the afternoon.
30th
Mainly cloudy but bright with a few light snow showers and a few longish sunny intervals .
31st
Sunny start becoming cloudy through mid morning to early afternoon. Some sunny intervals from mid afternoon.