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SEPTEMBER 2012 daily and monthly summary

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SEPTEMBER 2012
October

September 2012 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 65% 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 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
12.2 18.6 17.7 71 12.4 0.5 1023.9 FS 0.0 0.9 10 SSW  Cloudy
2nd
11.0 18.2 17.8 75 13.3 0.8 1023.1 FS 0.0 1.1 10 SSW  Cloudy
3rd
15.5 24.0 23.2 55 13.7 5.5 1023.5 FS 0.0 0.2 7 SSW  Sunny pm
4th
11.1 25.2 24.7 44 11.6 7.7 1021.0 FS 0.0 0.9 13 N  Sunny periods
5th
11.1 20.6 20.0 42 6.7 8.5 1024.9 RS 0.0 1.9 14 N  Sunny
6th
6.0 20.3 20.2 47 8.5 8.0 1026.0 F 0.0 0.8 11 SSW  Sunny
7th
8.7 25.0 24.6 29 5.4 8.2 1022.5 FS 0.0 1.0 11 SSW  Sunny
8th
7.3 26.2 26.1 23 3.3 7.7 1017.9 FS 0.0 0.5 8 SSW  Sunny
9th
8.3 27.6 26.2 30 7.3 7.0 1008.6 FS 0.0 2.2 19 SW  Sunny
10th
15.4 20.9 19.9 61 12.1 2.8 1009.8 ST 0.0 4.6 25 SW  Cloudy
11th
13.3 17.9 17.3 38 2.9 4.8 1012.2 RS 0.5 3.1 16 SSW  Sunny spells
12th
7.5 17.9 17.5 52 7.5 3.8 1012.0 F 1.3 2.4 18 SSW  Rain eve/night
13th
7.8 17.7 17.4 42 4.4 7.5 1018.1 FS 0.0 2.6 16 N  Sunny
14th
12.1 19.9 19.1 53 9.3 3.8 1010.8 ST 0.0 3.8 21 SSW  Sunny spells pm
15th
7.8 20.6 20.6 49 9.5 8.2 1015.2 FS 0.0 1.6 13 SSW  Sunny
16th
11.4 17.1 16.0 66 9.6 1.3 1011.0 FS 0.0 2.3 16 SSW  Cloudy
17th
10.7 18.4 17.2 52 7.3 4.2 1011.2 FS 0.0 2.2 14 SSW  Sunny spells
18th
10.8 17.4 17.0 42 4.0 6.3 1011.9 RS 0.0 2.2 16 SSW  Sunny spells
19th
5.6 17.0 16.8 37 2.0 6.0 1020.7 ST 0.0 1.0 13 SSW  Sunny periods
20th
6.7 17.1 17.0 48 5.9 3.2 1018.6 FS 0.0 1.3 14 SSW  Cloudy
21st
8.0 15.6 15.2 58 7.0 1.0 1012.0 FS 0.5 0.5 10 N  Rain eve
22nd
6.1 17.8 17.8 36 2.5 6.8 1018.4 FS 0.0 0.8 11 N  Sunny periods
23rd
6.8 11.3 10.1 89 8.4 0.0 1005.0 F 21.3 0.5 12 SE  Rain
24th
9.6 15.1 12.4 81 9.3 2.5 988.6 R 6.6 3.2 25 SW  Rain
25th
9.3 15.1 13.4 78 9.6 3.5 988.2 RS 2.8 2.9 18 SW  Rain showers
26th
9.3 13.8 12.9 86 10.7 1.7 991.7 RS 17.5 1.0 12 SW  Rain
27th
9.1 15.6 15.6 57 7.1 4.0 1007.6 R 0.8 1.2 12 N  Rain am
28th
7.0 17.2 15.9 69 10.3 2.2 1011.2 FS 1.0 2.4 21 SSW  Rain pm
29th
7.9 15.2 14.6 48 3.7 6.2 1017.5 ST 0.0 1.3 12 SSW  Sunny spells
30th
3.7 15.9 15.3 67 9.2 1.8 1017.1 FS 0.0 2.6 19 SW  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 1031 hPa W of Brittany, LP 994 hPa Faeroe Islands. A cloudy day due to a weak warm front with just brief moments of brightness.
2nd
A sunny spell in the morning with thickening cloud through the rest of the day.
3rd
Overcast but mild morning with some mist. Cloud clears around midday to give sunny periods.
4th
Mainly sunny with some patchy high cloud in the morning and clouding over around 18.00.
5th
HP 1033 hPa SW of Ireland. A sunny day with just a few patches of high cloud in mid-morning.
6th
A sunny day although sometimes hazy with patches of high cloud drifting across.
7th
Sunny with scarcely any cloud all day.
8th
HP 1021 hPa Belgian coast. A sunny day but always with patchy high cloud around, breaking the sunshine for a while in the afternoon.
9th
Sunny morning and afternoon but becoming cloudy by late afternoon with stronger winds and falling temperature.
10th
Overcast morning, brightening after midday with sunny spells but cloudy again by evening.
11th
A mixture of cloudy and sunny spells but mainly cloudy overall.
12th
A sunny start becoming cloudy from midmorning. Some sunny spells but mainly cloudy afternoon and evening. Rain from cold front around 21.00.
13th
Mostly sunny day with brief interruptions from some patches of high cloud.
14th
Mainly cloudy morning, sometimes rather dull, Brighter afternoon with sunny spells.
15th
HP 1021 hPa stretching from west of Brittany to the Atlantic, HP over central Europe. A sunny day with some patchy high cloud giving slight haze and only a few brief interruptions to sunshine.
16th
Mainly cloudy with some sunny intervals from late afternoon.
17th
Sunny spells with variable amounts of cloud, more cloudy later.
18th
Long sunny spells with a few cloudy breaks.
19th
Sunny periods - especially in the morning, more cloudy spells in the afternoon.
20th
A mainly cloudy day with some bright and sunny spells .
21st
HP ridge 1023 hPa W of Scotland. Mainly cloudy with brief weak sunshine am, clearing for a while early evening to give short spell of sunshine. Short spell of rain/drizzle from cold front late evening
22nd
Long sunny periods morning and early afternoon, cloud develops from mid-afternoon
23rd
LP 993 hPa Finisterre moving NE. A very poor Sunday, cool with persistent rain - sometimes heavy - for most of the day and evening.
24th
LP 984 hPa E England moving NE. Murky morning with rain from 10.00 - 13.00. Some sunny intervals in the afternoon.
25th
LP circling back to Wales. Short sunny spells with a few showers, one brief but torrential in the morning.
26th
LP 988 hPa Bristol Channel. Wrap-around occlusion brings spells of rain overnight becoming more persistent and heavy through the morning and gradually easing early afternoon. Some brighter spells with sunny intervals from mid afternoon.
27th
Cloudy morning with a spell of drizzle and light rain around 08.00. Brightening later with sunny spells.
28th
LP 980 hPa Faroe Islands. Cloudy with some sunny intervals. Rain from warm and cold fronts after 16.00 to 18.00.
29th
A sunny start with a cloudier spell around midday, more sunny spells in the afternoon.
30th
Sunny but hazy start, clouding over just after 10.00. A few sunny intervals after midday but becoming overcast by evening.