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AUGUST 2008 daily and monthly summary

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AUGUST 2008
Sept 2008

1st - 7th
LP 999 hpa, Northern Ireland, filling. Drizzle morning of 2nd but a fine end to the day. UK is covered by a rather strong (for the time of year) Atlantic Jet Stream. Twin LP near Ireland and N Scotland, HP 1024 hpa, E of Azores, with ridge 1020 hpa reaching SW France, weakening slightly. Light rain early hours of 3rd., and more rain and drizzle 4th and 5th. 6th: Low 998 hpa, far west of Ireland, moving east while filling, cold front passes late evening with 2 hours of thunder and lightning.
8th - 14th
8th, LP 993 hpa, S Scandinavia, moving NE while deepening. Linked disturbance moving away E, followed by a cooler, more stable, but still fairly humid NWly stream. Rain early morning and further rlight drizzle mid pm. The very unsettled weather continues with an active set of fronts moving into the UK from the Atlantic to the 9th. On the 12th, extended LP 985 hpa, over British Isles, drifting slowly towards Scandinavia brings frontal moderate/heavy rain early morning from 04.30 to 07.00 and blustery showers later. More heavy and blustery showers morning and middle of the day 13th with thunder, an yet more heavy showers around midday 14th.
15th - 24th
15th: Thundery low 1005 hpa, C France, filling. Low trough 1005 hpa, N Italy to Poland, drifting east while deepening. Temporary high cell building up towards 1016 hpa over NE France. Remaining unsettled with rain 17th (showers early morning) and 18th (morning rain and heavy showers late evening). 19th: HP 1016-1020 hpa over C Europe and the Mediterranean, weakening. LP 992 hpa, N England, drifting northeast. Moderate/heavy rain just after midnight 21st. Extended LP area 1009-997 hpa, Scotland to N Russia, filling. HP 1017-1020 hpa over C Europe and the Mediterranean, weakening on its SW part. Light showers early morning of 22nd. Remaining mostly cloudy with only brief spells of sunshine. Light rain morning of 24th.
25th - 31st
25th: HP 1025 hpa, Azores, with ridge 1020 hpa reaching Black Sea. Large cloud sheet results in cloudy and dull days with occasional very light drizzle and few brighter spells. 29th: High cell 1021 hpa, English Channel, drifting east. Low gradient towards 1018 hpa over S France and the Mediterranean, weakening. A rare sunny day this month on the 30th. 31st: HP cell 1023 hpa, Poland, moving away eastwards, LP cell 1009 hpa in English Channel moving NNE.


AUGUST 2008 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
20.4
 ºC ( -1.9C )*
 Daily Minimum
13.7
 ºC ( +0.8C)*
 Daily Mean
16.5
 ºC ( -0.4C )
 EXTREMES
 High Maximum
26.3
 ºC ( 30th )
 Low Minimum
8.5
 ºC ( 15th )
 Low Maximum
17.2
 ºC ( 13th )
 High Minimum
16.1
 ºC (   6th )
 
   
 Days with max => 25 °C
2
   
 Days with max in range 20 - 25 °C
15
   
 Days with max < 20 °C
14
   
 
PRECIPITATION
 Monthly Total
49.6
 mm ( 96% )*
 Days with measurable precip
20
 Days ( +9 )*
   ...of which, days with >= 1.0 mm
13
 Days ( +5 )*
   
   
 Days with Hail
0
 Days  
 Days with Thunder
1
 Days  
 RAIN RATE & EXTREMES
 High Rain Rate
22.6
 mm/hr ( 13th )
 High Rain Total in 1 day
10.7
 mm ( 12th )
 High Rain Total in 1 hour
5.8
 mm ( 12th, 06.40h)
 EVAPO-TRANSPIRATION
 Total for month
72.3
 mm  
 High Total for 1 day
3.8
 mm ( 1st )
APPARENT TEMPERATURE
 Low Wind Chill
8.5
 ºC ( 15th )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
8.6
 ºC ( 15th )
 High Temp/Hum/Wind Index
26.2
 ºC ( 30th )
 High Temp/Hum/Sun/Wind Index
32.2
 ºC ( 30th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
16.8
 ºC ( 31st )
 Low Dewpoint
5.7
 ºC ( 23rd )
 Average Dewpoint at 14h
12.3
 ºC  
 Low Relative Humidity
42
 % ( 23rd )
 Average RH at 14h
64
 %  
WIND SPEED & DIRECTION
 Monthly Average
2.8
 mph  
 Windiest day (Average)
6.1
 mph ( 10th )
 Highest Gust
29
 mph ( 12th )
 Dominant Direction
SSW
 (63%)
 
BAROMETER
 Monthly Mean
1010.2
 hPa  
 High Barometer
1021.7
 hPa ( 26th  )
 Low Barometer
985.4
 hPa ( 12th )
SUNSHINE
 Max Sensor Exposure to direct sun
9
 hours/day (15 possible)
 Calculated Monthly Sunshine Hours
88.3
 hours  
 Estimated Actual Hours (approx)
115.0
 hours  
 Sunniest Day Measured
8.5
 hours ( 30th )
 Days with no sunshine
3
 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 AUGUST 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
15.2 20.9 20.1 58 11.6 6.0 1012.9 RS 0.0 5.1 24 SSW
2nd
15.2 22.1 18.4 83 15.5 1.5 1010.7 FS 0.3 2.6 14 SSW
3rd
15.8 19.1 18.2 80 14.7 0.0 1008.9 FS 3.3 3.3 18 SSW
4th
11.6 20.7 19.5 62 12.0 1.8 1011.0 RS 1.3 2.4 16 SSW
5th
12.7 19.3 18.3 78 14.4 0.2 1013.8 FS 0.5 1.8 14 SSW
6th
16.1 25.7 25.2 57 16.1 3.7 1010.1 F 4.5 1.6 11 SSW
7th
16.0 23.3 22.4 53 12.3 6.3 1003.5 FS 0.3 2.1 16 SSW
8th
15.3 19.5 16.4 75 11.9 0.5 1012.9 R 2.0 1.7 16 N
9th
13.5 18.4 14.7 84 12.0 0.5 1011.4 FS 2.8 3.8 21 SSW
10th
15.6 20.6 19.8 61 12.1 6.0 1003.3 FS 0.3 6.1 26 SSW
11th
14.3 19.4 19.3 57 10.5 1.7 1001.8 FS 0.0 2.7 17 SSW
12th
14.2 19.5 17.4 68 11.4 6.5 991.9 R 10.7 5.1 29 SSW
13th
12.0 17.2 16.6 69 10.9 0.8 1000.3 R 5.3 6.1 28 SSW
14th
10.9 18.4 17.1 67 10.9 4.5 1012.4 RS 3.0 2.0 14 SSW
15th
8.5 21.3 20.4 46 8.4 7.8 1014.4 FS 0.0 1.5 16 SSW
16th
10.7 20.6 19.4 53 9.6 2.8 1007.3 FS 0.0 1.4 16 ESE
17th
14.8 19.8 18.2 57 9.6 3.2 1006.3 RS 1.3 2.7 18 SSW
18th
14.1 20.2 18.9 62 11.5 2.2 1003.1 ST 6.9 3.5 24 SSW
19th
14.0 19.2 18.7 65 12.0 3.0 1003.3 RS 0.3 5.3 20 SSW
20th
13.7 20.1 19.0 58 10.5 3.0 1011.9 RS 1.0 3.8 22 SSW
21st
13.9 20.3 19.8 62 12.3 3.3 1013.6 ST 3.6 2.8 14 SSW
22nd
12.7 20.3 20.1 53 10.2 3.5 1012.6 FS 0.5 0.8 11 N
23rd
9.9 20.9 20.9 47 9.2 5.3 1013.9 FS 0.0 2.3 13 SSW
24th
13.7 20.9 20.5 66 13.9 2.8 1008.1 ST 1.5 3.0 17 SSW
25th
11.6 18.4 17.7 79 14.0 0.6 1013.6 RS 0.0 3.3 21 SSW
26th
15.0 18.3 18.1 72 13.0 0.7 1020.9 RS 0.0 2.9 14 SSW
27th
15.2 19.8 19.3 67 13.0 1.3 1020.8 ST 0.0 2.5 13 SSW
28th
15.3 18.9 18.1 73 13.2 0.0 1020.1 FS 0.0 1.1 10 SSW
29th
16.5 21.3 21.3 68 15.1 0.0 1019.3 FS 0.0 0.4 6 SSE
30th
15.2 26.3 26.3 46 13.7 8.5 1013.7 F 0.0 0.9 13 ESE
31st
12.8 21.8 21.2 71 15.7 0.3 1009.2 FS 0.5 1.2 16 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