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JULY 2008 daily and monthly summary

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JULY 2008
August 2008
1st - 4th
HP 1022 hpa, Poland, drifting north while weakening. Low 985 hpa, far west of Ireland, drifting northeast. Moderate shower near midnight on the 1st, light showers on 2nd. On 3rd LP filling over C Europe, LP 989 hpa, far NW of Ireland, filling slowly. 4th: HP 1019 hpa over France, drifting NE while weakening, LP 997 hpa, far SW of Ireland, drifting slowly NE and deepening. Lowest July min temp since 2002.
5th - 12th
Complex LP lies in Celtic Sea circa 994mb 60m SSE of Cork. Cold front lying Belfast -Wash- E Kent at noon gave some morning showers. Occluded fronts push slowly NE into Scotland and another in SW England as well as a trough. 6th, LP deepens to 995 hPa moving NNE into the Irish Sea, bands of intermittent light rain from occlusion. 7th, more occlusions bring heavy showers before dawn followed by prolonged rain through the morning and more showers later with a rumble of thunder. 9th, LP 998 hpa, W of Ireland, deepening slowly, HP 1020hpa over south of France weakening; associated frontal activity brings steady light rain all day from 06.30 onwards. LP lingers in the North Sea on the 10th and 11th.
13th - 21st
HP 1029 hpa, NW of Azores, with ridge 1020 hpa towards C. France, strengthening. LP 1008 hpa, Northern Italy. Except for the 14th with long sunny periods, a rather cloudy but mostly dry spell. Light rain shower late pm of 17th. HP 1030 hpa, N of Azores, with ridge 1016 hpa over Biscay. LP 995 hpa, N of Scotland, drifting E. By 21st. HP 1030 hpa, SE of Ireland, drifting towards Northern France. LP 992 hpa, Southern Scandinavia, filling.
22nd - 28th
Longest warm spell of summer 2008 so far. HP 1029 hpa, Brittany, drifting slowly east while weakening slightly. A warm / hot spell but often cloudy with haze. Becoming, HP 1028 hpa, Scandinavia, drifting north. Slight LP area with low gradient over S France and the Med. Rather cloudy and humid day 25th. 28th: HP 1029 hpa, Norwegian Sea. Medium HP area with low gradient over S France and the Med. Extended LP 995 hpa, far SW of Iceland, drifting SE. Thundery shower late evening of 28th.
29th - 31st
Extended LP 995 hpa, far SW of Iceland, LP 1002 hpa drifting slowly towards Ireland. Heavy rain for an hour from cold front early hours of 29th.
JULY 2008 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
22.1
  ºC ( -0.5C )*
 Daily Minimum
13.0
  ºC ( -0.3C)*
 Daily Mean
17.3
  ºC ( ± 0.0C )*
 EXTREMES
 High Maximum
29.6
  ºC ( 28th)
 Low Minimum
8.7
  ºC (   4th )
 Low Maximum
16.2
  ºC (   9th )
 High Minimum
16.8
  ºC ( 23rd)
 
   
 Days with max => 25 °C
8
    
 Days with max in range 20 - 25 °C
13
    
 Days with max < 20 °C
10
    
 
PRECIPITATION
 Monthly Total
60.5
  mm ( 138% )
 Days with measurable precip
14
  Days ( +2 )
   ...of which, days with >= 1.0 mm
8
  Days  
   
   
 Days with hail
0
  Days  
 Days with Thunder
1
  Days  
 RAIN RATE & EXTREMES
 High Rain Rate
11.7
  mm/hr ( 29th )
 High Rain Total in 1 day
22.9
  mm (   7th )
 High Rain Total in 1 hour
8.4
  mm ( 29th, 02.00h)
 EVAPO-TRANSPIRATION
 Total for month
102.3
  mm  
 High Total for 1 day
5.04
  mm ( 1st)
APPARENT TEMPERATURE
 Low Wind Chill
8.7
  ºC (   4th )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
8.7
  ºC (   4th )
 High Temp/Hum/Wind Index
29.8
  ºC ( 28th )
 High Temp/Hum/Sun/Wind Index
35.7
  ºC ( 28th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
17.7
  ºC ( 31st )
 Low Dewpoint
4.0
  ºC ( 20th )
 Average Dewpoint at 14h
10.9
  ºC  
 Low Relative Humidity
30
  % ( 24th )
 Average RH at 14h
53
  %  
WIND SPEED & DIRECTION
 Monthly Average
2.3
  mph  
 Windiest day (Average)
4.8
  mph ( 10th )
 Highest Gust
26
  mph (   5th )
 Dominant Direction
SSW
  ( 49% )
 
BAROMETER
 Monthly Mean
1013.0
  hPa  
 High Barometer
1025.3
  hPa ( 22nd )
 Low Barometer
995.5
  hPa (   7th )
SUNSHINE
 Max Sensor Exposure to direct sun
10
  hours/day (15-16 possible)
 Calculated Monthly Sunshine Hours
154.7
  hours  
 Estimated Actual Hours (approx)
175.0
  hours  
 Sunniest Day Measured
9.2
  hours ( 1st )
 Days with no sunshine
1
  Days  
 
FOG
 Number of Days with Fog
0
  Days  
NEW RECORDS SET THIS MONTH
 
* deviation from average 1984 - 2007
‡ 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 70% 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 JULY 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
 10.3 26.7 26.4 36 10.1 9.2 1011.4 F 0.8 1.6 18 ESE
2nd
 15.6 18.7 17.5 66 11.1 1.7 1009.2 ST 0.5 0.8 8 SSW
3rd
 11.3 20.7 20.1 48 8.8 8.0 1009.7 R 0.0 2.5 20 SSW
4th
 8.7 21.6 21.4 41 7.6 5.0 1015.1 FS 0.0 1.2 14 ESE
5th
 14.5 20.5 19.9 45 7.6 8.0 1009.6 FS 0.8 3.1 26 SSW
6th
 13.2 17.1 14.1 87 12.0 3.0 1000.7 F 3.3 4.4 24 SSW
7th
 11.8 17.1 16.1 80 12.6 3.0 996.8 RS 22.9 4.9 21 SSW
8th
 12.8 18.4 17.9 49 7.1 5.7 1008.9 RS 0.3 4.3 21 SSW
9th
 11.7 16.2 16.1 89 14.2 0.0 1010.1 FS 13.0 2.7 19 SSW
10th
 13.2 19.9 19.7 57 10.9 7.7 1006.5 FS 2.8 4.8 22 SSW
11th
 13.2 20.1 19.8 55 10.5 4.8 1004.2 FS 1.0 4.4 21 SSW
12th
 10.1 17.8 17.3 49 6.5 4.5 1009.2 ST 0.3 2.2 16 SSW
13th
 10.6 20.7 18.6 49 7.6 4.3 1014.8 RS 0.0 1.3 10 SSW
14th
 10.4 22.7 22.2 46 10.0 8.0 1022.6 RS 0.0 2.5 17 SSW
15th
 15.8 23.9 22.2 69 16.3 3.8 1023.8 FS 0.0 3.0 14 SSW
16th
 15.0 21.4 20.5 45 8.2 5.3 1020.0 FS 0.0 1.7 13 N
17th
 13.7 18.7 17.5 64 10.6 0.5 1012.4 FS 0.3 2.0 17 SSW
18th
 13.3 19.1 18.4 68 12.4 0.5 1009.9 FS 0.0 2.9 16 SSW
19th
 14.8 21.7 21.7 44 8.9 5.5 1007.4 RS 1.3 3.5 20 SSW
20th
 10.3 18.0 17.1 49 6.3 2.7 1017.1 RS 0.0 2.4 19 N
21st
 9.7 20.4 19.9 41 6.3 7.5 1022.3 RS 0.0 2.1 14 N
22nd
 10.3 24.7 23.9 46 11.6 6.5 1024.2 FS 0.0 1.2 13 SSW
23rd
 16.8 26.3 24.9 52 14.4 3.3 1022.5 FS 0.0 0.6 13 ESE
24th
 13.6 28.4 28.3 32 10.0 8.2 1014.6 F 0.0 1.2 17 ESE
25th
 14.0 24.2 21.9 62 14.3 6.2 1010.1 RS 0.0 1.9 14 SSW
26th
 15.0 25.6 24.7 52 14.2 3.7 1014.7 ST 0.0 0.7 8 SSW
27th
 15.6 28.5 27.6 44 14.2 7.2 1015.8 FS 0.0 0.8 10 SSW
28th
 14.4 29.6 27.6 46 14.9 6.5 1011.9 FS 1.8 0.7 12 SW
29th
 14.4 21.8 20.9 60 12.8 4.3 1014.0 RS 11.4 3.0 20 SSW
30th
 11.9 26.1 25.9 34 8.9 8.3 1016.6 FS 0.0 1.2 16 SSW
31st
 16.1 27.3 27.3 50 16.0 1.8 1010.2 FS 0.0 0.6 11 SE
                       
‡ 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