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SEPTEMBER 2008 daily and monthly summary

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SEPTEMBER 2008
October 2008
1st - 3rd
LP 995 hpa northwest of Ireland, drifting slowly northeast. HP 1024 hpa, east of Azores. Light rain from 03h of 2nd lasting through to 14h with one heavy burst during passage of cold front. 3rd: LP 989 hpa N British Isles, deepening. Satellite LP 985 hpa, moving slowly northeast while deepening.
4th - 17th
[Absent] LP continues to dominate, with heavy rain and strong wings causing floods over W and N UK weekend 6th & 7th. More settled after the 13th.
18th - 24th
HP 1028 hpa, North Sea to S Scandinavia, strengthening and moving to the north-east. Warm with long periods of hazy sunshine. Some light rain 22nd and 23rd, HP 1032 hpa N Ireland drifting slowly to the east. Drizzle morning of 24th.
25th - 30th
HP 1036 hpa S of Norway strengthening and moving slightly to the south. Long periods of hazy sunshine to 27th, HP 1035 hpa far west of Ireland, almost stationary, with ridge 1027 hpa towards Austria, weakening. 30th, HP 1032 hpa NE of Azores, with ridge 1020 hpa towards Biscay, weakening. LP towards 991 hpa, North Sea, deepening, associated fronts bring light rain in the morning with heavy showers pm.

SEPTEMBER 2008 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
18.1
  ºC ( -1.0 C )*
 Daily Minimum
9.6
  ºC ( -0.9 C )*
 Daily Mean
13.3
  ºC  
 EXTREMES
 High Maximum
21.3
  ºC (   9th )
 Low Minimum
4.4
  ºC ( 28th )
 Low Maximum
14.4
  ºC ( 30th )
 High Minimum
13.3
  ºC (   5th )
 
   
 Days with max => 25 °C
0
    
 Days with max in range 20 - 25 °C
3
    
 Days with max < 20 °C
27
    
 
PRECIPITATION
 Monthly Total
48.5
  mm ( 87% )*
 Days with measurable precip
12
  Days ( +1 )*
   ...of which, days with >= 1.0 mm
6
  Days ( -3 )*
   
   
 Days with hail
0
  Days  
 Days with Thunder
0
  Days  
 RAIN RATE & EXTREMES
 High Rain Rate
82.3
  mm/hr ( 30th )
 High Rain Total in 1 day
14.4
  mm (   6th )
 High Rain Total in 1 hour
6.9
  mm ( 30th, 15.30)
 EVAPO-TRANSPIRATION
 Total for month
54.4
  mm  
 High Total for 1 day
3.3
  mm ( 3rd )
APPARENT TEMPERATURE
 Low Wind Chill
4.4
  ºC ( 28th )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
4.3
  ºC ( 28th )
 High Temp/Hum/Wind Index
20.8
  ºC (   9th)
 High Temp/Hum/Sun/Wind Index
26.7
  ºC (   9th)
 
DEWPOINT & HUMIDITY
 High Dewpoint
14.8
  ºC ( 11th )
 Low Dewpoint
2.4
  ºC ( 18th )
 Average Dewpoint at 14h
9.0
  ºC  
 Low Relative Humidity
35
  % ( 18th )
 Average RH at 14h
61
  %  
WIND SPEED & DIRECTION
 Monthly Average
1.7
  mph  
 Windiest day (Average)
4.9
  mph ( 3rd )
 Highest Gust
22
  mph ( 6th )
 Dominant Direction
SSW
  ( 63% )
 
BAROMETER
 Monthly Mean
1016.1
  hPa  
 High Barometer
1035.3
  hPa ( 26th )
 Low Barometer
986.5
  hPa (   5th )
SUNSHINE
 Max Sensor Exposure to direct sun
 9
  hours/day (12-13 possible)
 Calculated Monthly Sunshine Hours
111.5
  hours  
 Estimated Actual Hours (approx)
120.0
  hours  
 Sunniest Day Measured
8.3
  hours ( 19th )
 Days with no sunshine
1
  Day  
 
FOG
 Number of Days with Fog
0
  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 rather limited. The sensor receives approx 70% 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

   DAILY STATS SEPTEMBER 2008
 
TEMPERATURE ºc
HUMIDITY
SUN ‡
PRESSURE
RAINFALL
WIND SPEED
DIRECTION
DATE
Minimum
(21-09h)
Maximum
(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)
High Gust
(mph)
Dominant
(Compass)
                     
1st
 11.2 19.8 19.7 56 10.6 5.0 1012.8 FS 0.0 4.1 21 SSW
2nd
 12.4 15.8 13.2 88 11.3 2.0 1001.5 FS 11.2 4.4 21 SSW
3rd
 11.4 18.2 17.7 53 8.0 7.0 1000.7 FS 0.0 4.9 21 SSW
4th
 12.8 16.1 14.3 83 11.4 2.0 999.7 ST 3.0 4.2 20 SSW
5th
 13.3 16.5 14.9 89 13.1 0.7 990.5 FS 6.8 1.9 17 ESE
6th
 13.1 17.5 17.4 65 10.7 1.7 996.6 RS 14.4 4.3 22 SSW
7th
 12.7 15.3 14.4 82 11.4 0.2 1005.6 R 0.5 2.8 16 SSW
8th
 12.6 17.8 16.6 60 8.8 2.8 1014.0 RS 0.0 1.7 13 SSW
9th
 9.6 21.3 17.2 77 13.2 1.8 1008.9 RS 1.5 1.2 12 SSW
10th
 12.7 18.7 18.4 70 12.8 2.0 1011.5 FS 0.0 2.8 16 SSW
11th
 12.8 18.6 15.6 77 11.6 0.2 1007.5 RS 0.5 1.7 17 SSW
12th
 10.2 18.4 18.0 60 10.1 3.8 1012.2 FS 0.0 0.7 11 SSW
13th
 6.5 19.1 18.4 61 10.8 6.3 1018.4 FS 0.0 0.5 10 N
14th
 9.7 19.3 18.8 46 7.0 6.7 1022.9 FS 0.3 0.6 11 SW
15th
 7.2 18.0 15.8 58 7.5 3.8 1023.1 FS 0.0 0.3 8 SW
16th
 8.2 15.6 15.3 50 4.9 0.7 1022.3 FS 0.0 0.2 10 ESE
17th
 8.7 18.4 16.3 59 8.3 3.2 1020.6 FS 0.0 0.4 10 ESE
18th
 7.7 19.2 18.4 39 4.2 5.8 1021.5 FS 0.0 0.5 10 NNW
19th
 4.9 19.8 19.8 39 5.5 8.3 1027.1 ST 0.0 0.4 11 NNW
20th
 4.5 21.1 20.9 37 5.7 7.8 1029.2 F 0.0 0.4 12 ESE
21st
 5.2 19.8 17.8 50 7.3 7.2 1024.4 F 0.0 0.4 10 NNW
22nd
 7.2 18.0 16.7 63 9.6 1.2 1021.9 FS 0.3 0.9 13 N
23rd
 11.1 16.6 15.0 69 9.4 1.3 1022.0 FS 0.3 2.8 17 N
24th
 12.2 15.6 15.4 74 10.8 0.2 1023.3 RS 0.8 1.5 16 N
25th
 12.6 19.8 16.8 64 10.0 3.2 1030.9 RS 0.0 0.7 11 N
26th
 7.0 19.8 19.8 40 5.8 7.8 1033.8 FS 0.0 0.7 18 ESE
27th
 5.8 20.8 20.8 39 6.3 7.3 1029.2 F 0.0 0.2 6 ESE
28th
 4.4 18.9 18.7 51 8.4 7.2 1023.6 F 0.0 0.3 7 SSW
29th
 7.8 15.4 15.2 47 3.9 4.3 1017.2 FS 0.0 1.6 16 SSW
30th
 11.1 14.4 13.3 84 10.7 0.0 1003.5 F 8.9 4.1 20 SSW
                       
‡ 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 approx 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