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SEPTEMBER 2010
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| 1st - 5th | 1st, HP 1026 hPa N wales extending SE, long sunny periods slightly hazy. 2nd, sunny periods, longer with more haze pm. 3rd, sunny spells again sometimes hazy, and same again on the 4th. 5th, HP 1030 hPa Southern Norway, LP 993 hPa to far W of Ireland, mainly cloudy but bright with some sunny intervals. |
| 6th - 11th | 6th, LP 990 hPa Atlantic and 996 hPa Ireland, light rain from trough pm then more prongled and heavier rain evening into night from occluded front. 7th, moderate rain shower with hail just after midday, sunny spells. 8th, light rain am, cloudy with a little sunshine. 9th, mixture of sunny spells and cloud. 10th, light rain before dawn cloudy later with sunny intervals. 11th, mainly cloudy and dull with some light drizzle am then moderate rain late pm. |
| 12th - 18th | 12th, HP 1034 hPa NE of Azores, ridging to UK, LPs to N and NW, a little rain around 1am, sunny spells during the day. 13th, cloudy, light rain early evening. 14th, HP 1028 hPa Biscay, LP 985 hPa N of Scotland, numerous fronts and troughs, overcast day with a little rain just after midnight and brief heavy rain from cold front evening/night. 15th. sunny am, cloudier pm. 16th, cloudy with a couple of light showers, sunny late pm. 17th, sunny start, cloudier later. 18th, long sunny spells with some cloudier intervals. |
| 19th - 23rd | 19th, HP 1022 hPa central France, LP 997 hPa south of Iceland 20°W, LP 994 hPa Finland, early brightness gives way to cloud for the afternoon. 20th, trace of rain from rain shower am, becoming brighter with usual sunny intervals first and cloud later. 21st, fog clearing by 9am, followed by cloudy/sunny spells. 22nd, more dense fog clearing by 10am followed by sunshine but rather hazy with extensive cirrus. 23rd, rather cloudy with 25 mins light rain a little after 14.00h. |
| 24th - 30th | 24th, rain shower 8.20 clearing for brighter morning but cloudy pm. 25th, LP 998 hPa W of Denmark, HP 1024 hPa NW of Ireland. 26th, LP 1006 hPa Belgium, fronts give rain from late pm and evening with drizzle to midnight and just after. 27th & 28th almost identical days, some light rain after midnight , rather cloudy with some brightness arounfd the middle of the day. 29th, once again light rain very early am, rain shower midmorning with brighter spells pm, followed by rain from warm and cold fronts from evening into the night. 30th, rain turns to drizzle after midnight, sunny am with early mist, cloudier pm but still sunny spells. |
| SEPTEMBER MONTHLY SUMMARY |
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| ‡ 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" |
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DAILY STATS SEPTEMBER 2010 |
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TEMPERATURE ºc |
HUMIDITY |
SUN ‡ |
PRESSURE |
RAINFALL |
WIND SPEED |
DIRECTION |
WEATHER NOTES ‡ |
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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 ‡ |
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1st |
6.2 | 22.8 | 22.3 | 35 | 6.1 | 7.3 | 1019.3 | FS | 0.0 | 0.5 | 11 | SW | Sunny periods |
2nd |
8.0 | 21.9 | 21.6 | 47 | 9.8 | 6.8 | 1019.3 | FS | 0.0 | 0.6 | 12 | N | Sunny spells |
3rd |
9.2 | 22.8 | 21.9 | 45 | 9.5 | 5.8 | 1019.7 | FS | 0.0 | 0.4 | 11 | SE | Sunny spells |
4th |
8.8 | 22.3 | 21.1 | 48 | 9.7 | 4.3 | 1019.7 | FS | 0.0 | 0.5 | 13 | SE | Sunny spells |
5th |
11.6 | 21.9 | 19.9 | 45 | 7.6 | 1.7 | 1017.5 | FS | 0.0 | 0.7 | 12 | SE | Cloudy |
6th |
10.4 | 20.6 | 15.3 | 78 | 11.5 | 1.0 | 1004.9 | F | 6.9 | 1.0 | 18 | SE | Rain pm, eve |
7th |
11.4 | 20.1 | 18.9 | 63 | 11.7 | 5.8 | 999.9 | FS | 0.5 | 1.4 | 14 | SW | Hail pm |
8th |
12.6 | 18.4 | 18.3 | 72 | 13.2 | 2.2 | 1001.8 | RS | 0.8 | 0.6 | 10 | N | Rain am |
9th |
13.1 | 22.1 | 19.4 | 63 | 12.2 | 5.0 | 1014.3 | RS | 0.0 | 1.5 | 16 | SSW | Sunny spells |
10th |
13.2 | 19.7 | 19.3 | 72 | 14.2 | 1.3 | 1017.3 | FS | 0.3 | 2.8 | 20 | SW | Rain am |
11th |
15.4 | 18.6 | 18.3 | 81 | 15.0 | 0.2 | 1014.5 | RS | 1.8 | 3.0 | 17 | SW | Rain pm |
12th |
11.4 | 19.6 | 18.8 | 52 | 8.7 | 4.7 | 1022.0 | RS | 0.3 | 1.1 | 16 | SSW | Rain night/am |
13th |
8.8 | 18.0 | 17.8 | 66 | 11.4 | 1.3 | 1023.7 | F | 0.3 | 2.6 | 17 | SW | Rain eve |
14th |
14.3 | 18.6 | 18.6 | 79 | 14.9 | 0.0 | 1013.9 | F | 5.1 | 5.4 | 25 | SW | Rain eve |
15th |
9.2 | 16.6 | 16.2 | 52 | 6.3 | 3.7 | 1009.3 | F | 0.0 | 2.9 | 21 | SSW | Cloudy pm |
16th |
11.1 | 16.7 | 16.0 | 62 | 8.7 | 3.3 | 1009.8 | FS | 0.5 | 1.5 | 12 | SSW | Rain showers pm |
17th |
7.8 | 15.4 | 14.9 | 46 | 3.4 | 3.7 | 1015.8 | RS | 0.0 | 1.4 | 21 | N | Cloudy pm |
18th |
5.6 | 17.6 | 16.2 | 46 | 4.6 | 6.0 | 1018.1 | FS | 0.0 | 1.0 | 13 | SSW | Sunny spells |
19th |
10.5 | 17.1 | 16.6 | 62 | 9.3 | 2.5 | 1014.3 | FS | 0.0 | 3.4 | 20 | SW | Cloudy pm |
20th |
14.6 | 21.5 | 20.8 | 59 | 12.5 | 4.0 | 1012.6 | ST | 0.0 | 3.2 | 16 | SW | Sunny spells |
21st |
9.9 | 21.8 | 21.3 | 53 | 11.4 | 4.3 | 1018.4 | ST | 0.0 | 0.4 | 8 | SSW | Fog am |
22nd |
10.9 | 23.2 | 22.8 | 47 | 10.9 | 7.7 | 1014.2 | FS | 0.0 | 1.2 | 17 | SW | Fog am |
23rd |
12.9 | 18.7 | 17.6 | 83 | 14.6 | 1.0 | 1004.2 | F | 0.5 | 1.7 | 3.0 | SW | Rain pm |
24th |
10.7 | 15.8 | 13.7 | 78 | 9.9 | 0.5 | 1004.3 | R | 0.3 | 3.1 | 21 | N | Rain shower am |
25th |
6.2 | 14.0 | 13.1 | 54 | 4.0 | 5.0 | 1014.5 | ST | 0.0 | 3.7 | 17 | N | Sunny periods |
26th |
7.3 | 13.4 | 13.4 | 72 | 8.4 | 0.0 | 1009.5 | FS | 4.3 | 3.9 | 21 | N | Rain pm/eve |
27th |
10.6 | 15.1 | 14.9 | 70 | 9.5 | 1.5 | 1011.6 | RS | 0.3 | 0.4 | 10 | N | Cloudy |
28th |
13.3 | 17.3 | 16.6 | 76 | 12.4 | 1.0 | 1016.0 | RS | 0.3 | 0.0 | 2 | N | Cloudy |
29th |
13.5 | 17.2 | 17.2 | 70 | 11.7 | 0.8 | 1014.5 | FS | 7.9 | 1.2 | 13 | SW | Rain eve/night |
30th |
8.5 | 16.1 | 15.9 | 63 | 8.9 | 6.5 | 1012.6 | FS | 0.5 | 0.8 | 11 | SSW | Rain night/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 |