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SEPTEMBER 2010 daily and monthly summary

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SEPTEMBER 2010
October

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
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
18.8
 ºC ( - 0.3C )*
 Daily Minimum
10.6
 ºC ( ± 0.0C )*
 Daily Mean
14.24
 ºC ( c. -0.15C )
 EXTREMES
 High Maximum
23.2
 ºC ( 22nd  )
 Low Minimum
5.6
 ºC ( 18th )
 Low Maximum
13.4
 ºC ( 26th )
 High Minimum
15.4
 ºC ( 11th )
 
   
 Days with max => 20 °C
11
  ( ± 0 )
 Days with max <15 °C
2
  ( ± 0 )
 Days with min <10 °C
12
  ( ± 0 )
 
PRECIPITATION
 Monthly Total
30.5
 mm ( 56% )
 Days with measurable precip
16
 Days ( +4 )*
   ...of which, days with >= 1.0 mm
5
 Days ( -4 )*
   ...and days with hail observed
1
 Days  
 Days with Thunder
0
 Days  
 
   
 RAIN RATE & EXTREMES
 High Rain Rate
82.3
 mm/hr ( 14th )
 High Rain Total in 1 day
7.9
 mm ( 29th)
 High Rain Total in 1 hour
4.6
 mm ( 14th, 21h16 )
 EVAPO-TRANSPIRATION
 Total for month
53.9
 mm  
 High Total for 1 day
3.0
 mm ( 1st )
APPARENT TEMPERATURE
 Low Wind Chill
4.0
 ºC ( 25th )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
6.3
 ºC (   1st )
 High Temp/Hum/Wind Index
22.8
 ºC ( 22nd )
 High Temp/Hum/Sun/Wind Index
28.4
 ºC (   3rd )
 
DEWPOINT & HUMIDITY
 High Dewpoint
15.6
 ºC ( 11th )
 Low Dewpoint
2.1
 ºC ( 25th )
 Average Dewpoint at 14h
61
 ºC  
 Low Relative Humidity
34
 % (   1st )
 Average RH at 14h
10.1
 %  
WIND SPEED & DIRECTION
 Monthly Average
1.7
 mph  
 Windiest day (Average)
5.4
 mph ( 14th )
 Highest Gust
25
 mph ( 14th )
 Dominant Direction
SW
 ( 30% )
 
BAROMETER
 Monthly Mean
1013.9
 hPa  
 High Barometer
1026.2
 hPa ( 13th  )
 Low Barometer
999.1
 hPa (   8th )
SUNSHINE
 Max Sensor Exposure to direct sun
8.5
 hours/day (12 - 13 possible)
 Calculated Monthly Sunshine Hours
98.9
 hours  
 Estimated Actual Hours (approx)
122.0
 hours  
 Sunniest Day Measured
7.7
 hours ( 22nd )
 Days with no sunshine
2
 Days  
 
FOG
 Number of Days with Fog
6
 Days  
NEW RECORDS SET THIS MONTH
 
‡ 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 2010
 
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
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