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SEPTEMBER 2011 daily and monthly summary

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SEPTEMBER
October

September 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 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 SEPTEMBER 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
8.8 22.7 22.5 43 9.3 8.0 1011.5 F 0.0 0.7 13 SE  Sunny
2nd
11.4 25.3 24.6 54 14.6 7.3 1009.4 FS 0.0 0.8 12 SW  Sunny periods
3rd
12.6 23.9 22.7 58 14.0 6.5 1007.3 FS 0.0 1.6 14 SW  Sunny periods
4th
14.7 18.8 17.2 89 15.4 2.0 1004.7 FS 3.6 2.2 17 SW  Rain pm
5th
11.2 18.8 17.3 60 9.5 3.8 1011.4 RS 1.0 5.1 27 SW  Rain showers
6th
14.6 16.3 16.0 90 14.4 0.0 1004.9 FS 12.2 7.5 29 SW  Rain
7th
11.3 16.9 16.9 60 9.1 0.8 1010.7 FS 0.5 4.5 19 SW  Rain showers pm
8th
12.4 18.7 17.5 72 12.4 1.2 1007.3 ST 0.0 3.2 18 SW  Cloudy
9th
15.7 20.5 20.2 76 15.9 0.2 1009.3 FS 0.3 2.0 13 SW  Cloudy
10th
16.4 22.5 21.0 69 15.1 1.8 1002.7 ST 4.3 3.0 20 SW  Cloudy
11th
14.6 19.9 19.2 58 10.8 5.7 1004.4 ST 1.0 5.1 26 SW  Rain showers am
12th
15.1 20.3 19.2 63 12.0 5.2 1003.8 R 1.8 7.4 29 SW  Rain am
13th
12.3 19.1 16.4 68 10.5 5.5 1010.7 ST 0.0 4.2 21 SW  Sunny spells
14th
9.7 18.8 18.0 52 8.0 5.0 1016.7 FS 0.0 2.4 16 SSW  Sunny spells
15th
6.4 20.6 18.7 52 8.6 2.5 1018.8 FS 0.0 0.3 6 SE  Sunny spells
16th
9.7 22.7 21.5 53 11.5 6.3 1008.8 F 0.0 1.4 14 SW  Sunny spells
17th
13.4 16.4 16.0 65 9.4 3.7 1003.7 FS 3.0 3.7 22 SW  Rain am
18th
5.8 16.6 15.8 59 7.8 2.5 1000.7 FS 0.0 0.7 8 SSW  Cloudy
19th
8.9 18.9 17.9 54 8.4 4.8 1013.1 RS 0.0 2.2 14 SSW  Sunny spells
20th
14.5 19.2 16.2 81 13.0 1.0 1017.9 ST 0.0 4.3 19 SW  Cloudy
21st
14.3 18.0 18.0 61 10.4 4.3 1014.7 FS 2.0 3.5 18 SW  Rain am
22nd
11.6 18.9 18.7 47 7.1 4.0 1018.4 FS 0.0 2.3 16 SSW  Sunny spells
23rd
7.4 18.6 18.6 54 9.1 7.7 1016.0 F 0.0 0.9 11 SSW  Sunny periods
24th
7.3 20.1 19.6 59 11.3 3.7 1012.3 FS 0.0 0.7 13 SW  Fog am
25th
9.4 21.2 20.6 59 12.3 6.7 1014.6 FS 0.0 1.9 18 SW  Fog am
26th
14.8 21.9 21.6 61 13.8 4.2 1020.6 RS 0.0 2.4 16 SW  Sunny spells pm
27th
11.8 23.3 23.2 55 13.7 4.7 1027.5 ST 0.0 0.4 7 SW  Fog am
28th
10.1 26.3 26.2 47 14.0 7.2 1024.3 F 0.0 0.5 14 SE  Fog am
29th
11.8 27.9 27.9 43 14.2 7.2 1021.7 FS 0.0 0.4 11 SE  Fog am
30th
11.5 28.6 28.6 38 12.8 7.2 1021.0 FS 0.0 0.3 11 SE  Fog am
                         
‡ 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 1017 hPa North Sea, Ex Hurricane Irene 982 hPa SSW of Iceland. Long sunny periods with some patches of cloud.
2nd
Periods of hazy sunshine but also some longer cloudy spells.
3rd
Fog and mist clears after 09.00 to give periods of hazy sunshine, increasing cloud from late pm.
4th
LP 993 hPa SW Ireland. Cloudy morning, rain - briefly heavy - from 13.00 to 14.30. Brighter afterwards with some late sunshine.
5th
LP 998 hPa NE Scotland. Sunny and dry morning, cloud developing after 10.00. Sunshine and rain showers pm.
6th
LP 976 hPa N of Scotland. Dull all day, rain - a little intermittently - falls from 06.00 until evening. Very heavy burst from cold front at 18.00h.
7th
Cloudy with just a little sunshine, light rain showers pm and evening.
8th
Mainly overcast morning brightening a little mid afternoon with some sunshine.
9th
Some light rain/drizzle overnight. Mainly cloudy/overcast day with just a very brief sunny interval pm.
10th
Bright day although still with much cloud and little sunshine. Clouding over pm with moderate/heavy rain from 17.30 - 19.30.
11th
Rain showers 05.00 to 07.00. Bright morning with sunny periods developing after 10.00.
12th
Ex-hurricane Katia 972 hPa Outer Hebrides. Light rain / drizzle intermittent from 05.30 to 10.30, clearing to give sunny spells pm.
13th
Sunny spells from mid morning with two short and light rain showers mid-afternoon.
14th
Sunny start, cloud develops after 10.00h but still some long sunny spells.
15th
Sunny start, cloud develops after 11.00h with sunny intervals.
16th
Cloudy start with sunny periods developing after 09.30.
17th
Cloudy with showery rain morning, brighter afternoon with sunny intervals.
18th
Three LP cells of 999 hPa close to the UK. Sunny start, clouding over with short sunny intervals.
19th
Mixture of cloudy and sunny spells through the day.
20th
Mainly cloudy, a few sunny intervals mostly in the morning.
21st
LP 982 hPa Faeroe Islands. Rain and drizzle morning from straggling front. Brightening after midday with sunny spells.
22nd
Mainly cloudy with some sunny spells afternoon.
23rd
Periods of hazy sunshine.
24th
Mist and fog clearing around 10.45 to give sunny spells.
25th
Fog clearing around 09.30 to give (hazy) sunny periods.
26th
Overcast morning slowly clearing to give sunny spells in the afternoon.
27th
Fog, mist and low cloud slowly clearing just after midday to give a sunny afternoon. New site maximum temperature record for the date.
28th
Fog and mist clearing by 09.00 followed by uninterrupted sunshine. New site maximum temperature record for the date.
29th & 30th
More shallow fog and mist, clearing by 09.00 followed by uninterrupted sunshine. New site maximum temperature record for the dates.