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MAY 2013 daily and monthly summary

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MAY 2013
June

May 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 70% of total possible sunshine exposure this month due to building obstruction while the sun is low in the sky. 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 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
4.3 17.7 17.1 35 1.5 8.3 1020.4 FS 0.0 1.1 11 N  Sunny periods
2nd
3.1 17.4 14.1 36 -0.8 6.2 1020.8 ST 0.0 1.1 13 NE  Sunny periods
3rd
2.1 19.9 19.2 30 1.2 8.5 1016.8 FS 0.0 1.1 13 SSW  Sunny
4th
6.7 14.7 14.6 62 7.4 2.0 1015.0 FS 0.3 3.0 21 SSW  Light rain
5th
6.3 19.7 19.2 40 5.3 7.2 1020.2 FS 0.0 1.1 10 SSW  Sunny spells
6th
8.3 21.4 20.4 43 7.4 5.2 1017.8 FS 0.0 0.5 8 SSW  Sunny spells
7th
6.2 21.3 20.0 44 7.4 4.7 1014.7 FS 0.0 0.4 8 SE  Sunny spells
8th
8.8 16.4 15.4 66 9.1 2.7 1005.3 ST 2.5 3.2 24 SSW  Rain am
9th
6.8 13.7 13.3 52 3.6 5.3 1007.6 FS 0.8 7.0 33 SW  Rain evening
10th
9.1 16.6 16.1 55 7.1 3.0 1011.1 FS 0.0 5.9 22 SW  Cloudy
11th
7.0 15.2 11.8 80 8.5 2.5 1008.5 ST 13.0 3.8 24 SSW  Heavy rain showers
12th
5.1 15.5 14.1 46 2.6 3.8 1014.2 FS 0.8 3.6 19 SSW  Rain pm
13th
10.0 14.7 14.5 42 1.7 5.2 1010.0 FS 0.5 4.6 25 SSW  Rain showers eve
14th
6.9 11.2 9.3 79 5.8 2.0 1001.6 F 9.1 3.4 32 SW  Rain
15th
6.5 12.8 9.6 67 3.8 3.0 996.1 R 1.3 5.1 28 SW  Rain am night
16th
3.0 16.4 14.1 46 2.6 6.2 997.2 FS 0.0 0.9 13 SW  Sunny spells
17th
6.3 11.4 10.6 69 5.2 0.2 1005.7 RS 0.0 1.1 12 N  Cloudy
18th
7.0 15.8 14.6 52 4.8 4.0 1005.4 FS 0.0 1.2 12 N  Cloudy
19th
8.9 19.1 18.6 44 6.1 7.2 1009.7 ST 0.0 1.6 14 N  Sunny spells
20th
9.9 15.6 13.6 89 11.8 0.0 1009.1 ST 1.0 2.4 18 N  Rain
21st
11.2 12.7 12.3 72 7.4 1.2 1014.9 RS 0.0 3.3 21 N  Overcast
22nd
8.7 13.7 13.6 65 7.1 0.7 1016.9 FS 0.0 1.4 13 N  Cloudy
23rd
5.8 11.3 8.6 59 1.0 5.0 1011.0 ST 1.0 2.8 22 N  Rain/Hail showers
24th
4.3 7.8 6.7 86 4.5 0.3 1004.0 F 8.4 2.1 13 SW  Rain
25th
5.0 15.6 14.4 46 2.9 10.8 1019.4 ST 3.8 2.9 16 N  Rain night am
26th
5.2 19.7 18.5 30 0.6 11.7 1016.3 FS 0.0 2.2 13 SW  Sunny
27th
4.7 17.5 17.3 38 2.8 11.2 1006.7 FS 0.0 2.8 20 SW  Sunny
28th
9.8 13.4 11.1 88 9.2 1.2 997.9 RS 10.4 0.8 13 SE  Rain
29th
7.8 13.2 11.0 87 8.9 1.3 1003.6 RS 1.3 1.8 15 N  Rain
30th
10.2 13.4 12.5 86 10.2 0.2 1009.6 RS 4.1 2.4 14 N  Rain showers
31st
10.1 21.1 19.5 56 10.5 4.3 1017.0 ST 0.0 2.5 14 N  Sunny spells 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. While the sensor was temporarily relocated a few meters away which gives more sunshine exposure, it still receives less than 75% 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 Denmark, 1032 hPa NE of Azores. Early cloud clears to give long sunny periods interrupted by small patches of medium heightl cloud now and again.
2nd
A sunny morning with a slight haze, slow moving sheet of mid height cloud covers sky for much of the afternoon before clearing again.
3rd
A day of uninterrupted sunshine and largely clear skies.
4th
A cloudy day with a couple of outbreaks of light rain and some sunny intervals.
5th
A day with some long sunny spells but more cloudy in late afternoon and evening.
6th
A clear and sunny start but cloud increases in mid morning to permit just a few sunny spells from late morning onwards. Clearer by early evening again.
7th
Another clear and sunny start but cloud moves in by 09.00 allowing only some sunny intervals and spells until after 16.00 when it clears again.
8th
LP 987 hPa W of Donegal. A spell of moderate/heavy rain early morning, becoming drizzly later. Some short sunny spells from late morning to mid afternoon, and becoming windy.
9th
LP 986 hPa Northern Ireland. A mixture of cloudy and sunny spells through the day. Very windy with a new high windspeed record for any May since the anemometer was installed. A band of rain arrives during the evening.
10th
A mainly cloudy day but some sunny spells in the afternoon.
11th
A spell of heavy rain in early morning followed by a long dry and bright period. A band of rain with very heavy bursts arrives in early afternoon and there are further rain showers until evening.
12th
Bright morning and early afternoon with sunny spells. Cloudy from mid afternoon with a spell of drizzle/light rain into early evening.
13th
Cloudy to start with sunny spells developing. More cloudy in the afternoon with some rain showers by early evening.
14th
LP 988 hPa Scilly. A few sunny spells in the morning, intermittent rain and drizzle arrives around 10.45. More persistent and heavier rain by late afternoon into the evening and night.
15th
Rain continues overnight. Mainly cloudy morning and early afternoon. Brightening to give some sunny intervals with some brief light rain showers.
16th
Fog and mist clearing before 09.00 to give a mainly cloudy morning. Sunny spells developing from late morning with longer periods of sunshine later.
17th
Early brightness soon gives way to cloud. Cool and overcast for most of the day and sometimes gloomy.
18th
Some hazy sunshine in the morning before cloud increases. Often cloudy but some short sunny spells and intervals through the day and evening.
19th
A mainly cloudy but bright morning with some long sunny spells developing in the afternoon .
20th
LP 1007 hPa Denmark. A dreary day with a spell of rain first thing. Remaining overcast and gloomy all day with a spell of drizzle in early afternoon, although temperature climbs throughout.
21st
Overcast and sometimes dull until after 18.00 when the cloud breaks slowly to give sunny spells.
22nd
Another overcast day with only a few short bright/sunny intervals after 18.30.
23rd
Cloudy start, clearing to give some sunny spells but also some brief rain and hail showers from midmorning into the evening. Feeling very cool during showers .
24th
LP 1003 hPa, filling, tracking from North Sea across E and SE England. Outbreaks of rain, heaviest in the afternoon with just a sunny interval in the morning. One of the coldest days in May in these site records.
25th
Rain continues overnight and clears. Sunny intervals in the morning, cloud gradually clearing to give longer sunny spells especially in the afternoon and clear by early evening.
26th
A day with mainly uninterrupted sunshine, hazy at first but clearer later.
27th
The Bank Holiday Monday, and again, after some early cloud, long periods of sunshine with just occasional short interruptions.
28th
LP 1000 hPa developing over NW France moving north. Spell of rain from trough early am, heaviest around 07.30. Prolonged moderate rainfall from midday through the afternoon to 16.00. Sky clears in the evening.
29th
A bright morning with sunny spells for a while. A band of rain moves down from the NE in early afternoon, staying very gloomy after it passes with some light drizzle.
30th
A spell of rain in early morning, staying cloudy with only momentary brightness. A couple of long rain showers, the first heavy, in the afternoon. Overcast and dull end to the day.
31st
A cloudy morning, very slowly clearing to give some long sunny spells in the afternoon.