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JUNE 2009 daily and monthly summary

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JUNE 2009
July

1st - 4th
1st: HP 1036 hPa S of Iceland, 1024 hPa Sweden, LP 1001 hPa Azores, virtually unbroken sunshine. 2nd, unbroken sunshine again. 3rd, weak and dry cold front crosses the area pm.
5th - 10th
An unsettled and cool spell. 5th, slow moving LP developing to the SW, light rain and drizzle am. 6th, LP 998 hPa in English Channel, drizzle early am and weak sunshine pm. 7th, heavy rain with thunder early am but a fine pm. 8th, rain from 11pm to 3am on the 9th, LP drifting slowly into southern N Sea. 10th more rain during late morning.
11th - 18th
Weak HP ridging. HP 1023 hPa centred off Belgian coast, LP 996 hPa far W of Ireland. Trace of rain 11th from light, short showers am, cloudy start but sunnier late pm and evening. 13th mainly cloudy, sunnier later. 14th, LP 1016 hPa North Sea, LP 1007 hPa W of Ireland, HP 1024 hPa Balkans. 15th, thundery showers early pm with some heavy rain. 17th, LP 991 hPa S of Iceland, HP 1023 hPa Eastern Europe.
19th - 28th
Automatic readings only, no visual observation .
29th - 30th
HP 1025 hPa North Sea, separate HP 1029 hPa Gulf of Bothnia, LP 996 hPa to W of Ireland. Virtually uninterrupted sunshine, hot and rather humid.

JUNE 2009 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
22.2
 ºC ( +1.8C )*
 Daily Minimum
11.6
 ºC ( +0.5C )*
 Daily Mean
16.23
 ºC ( +0.9C)*
 EXTREMES
 High Maximum
30.6
 ºC ( 30th  )
 Low Minimum
5.9
 ºC (   8th )
 Low Maximum
13.4
 ºC (   5th )
 High Minimum
18.4
 ºC ( 28th )
 
   
 Days with max => 25 °C
7
  ( +3 )*
 Days with max in range 20 - 25 °C
12
  ( ±0 )*
 Days with max < 20 °C
11
  ( -3 )*
 
PRECIPITATION
 Monthly Total
21.6
 mm ( 50% )*
 Days with measurable precip
8
 Days ( -3 )*
   ...of which, days with >= 1.0 mm
6
 Days ( +1 )*
   ...and days with hail observed
0
 Days  
 Days with Thunder
2
 Days  
 
   
 RAIN RATE & EXTREMES
 High Rain Rate
26.9
 mm/hr ( 7th )
 High Rain Total in 1 day
7.1
 mm ( 7th )
 High Rain Total in 1 hour
5.8
 mm ( 7th, 06.51h)
 EVAPO-TRANSPIRATION
 Total for month
101.0
 mm  
 High Total for 1 day
4.9
 mm ( 30th )
APPARENT TEMPERATURE
 Low Wind Chill
5.9
 ºC (   8th)
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
5.8
 ºC (   8th )
 High Temp/Hum/Wind Index
30.6
 ºC ( 30th )
 High Temp/Hum/Sun/Wind Index
36.6
 ºC ( 30th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
15.9
 ºC ( 26th )
 Low Dewpoint
2.4
 ºC (   1st )
 Average Dewpoint at 14h
9.0
 ºC  
 Low Relative Humidity
28
 % (   2nd )
 Average RH at 14h
47
 %  
WIND SPEED & DIRECTION
 Monthly Average
1.3
 mph  
 Windiest day (Average)
3.0
 mph ( 17th )
 Highest Gust
20
 mph ( 17th )
 Dominant Direction
SW
 ( 21% )
 
BAROMETER
 Monthly Mean
1016.3
 hPa  
 High Barometer
1028.7
 hPa ( 23rd )
 Low Barometer
997.0
 hPa (   7th )
SUNSHINE
 Max Sensor Exposure to direct sun
9.3
 hours/day (15+ possible)
 Calculated Monthly Sunshine Hours
161.4
 hours  
 Estimated Actual Hours (approx)
212.0
 hours  
 Sunniest Day Measured
9.3
 hours ( 2nd & 30th)
 Days with no sunshine
1
 Days  
 
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 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 JUNE 2009
 
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
12.3 25.5 25.5 42 11.6 9.2 1023.5 FS 0.0 1.4 16 N  Sunny
2nd
11.3 26.4 26.1 31 7.7 9.3 1023.5 FS 0.0 1.0 13 N  Sunny
3rd
12.4 20.4 17.8 58 9.5 3.0 1020.5 FS 0.0 0.7 11 SE  Cloudy pm
4th
7.1 19.7 18.7 38 4.1 7.0 1016.9 F 0.0 1.1 12 N  Sunny
5th
8.5 13.4 13.2 69 7.7 0.0 1008.4 F 0.5 0.5 10 SE  Rain am, dull
6th
9.3 16.7 16.6 50 6.1 4.0 1000.5 FS 0.8 1.0 12 SE  Drizzle am.
7th
8.7 17.7 16.3 43 3.7 8.2 999.9 RS 7.1 1.6 16 SW  Rain, Thunder am.
8th
5.9 18.3 17.2 50 6.7 4.3 1004.7 FS 1.5 0.9 13 SE  Rain night. Dull
9th
10.1 16.2 15.0 71 9.8 0.2 1004.5 FS 6.3 0.9 13 N  Rain am.
10th
9.8 16.8 16.4 62 9.1 2.5 1009.3 FS 3.3 1.0 12 SW  Rain am.
11th
10.4 19.6 19.2 40 5.2 7.0 1017.4 RS 0.0 3.0 19 SW  Sunny spells
12th
7.3 20.5 18.4 47 6.9 4.0 1020.5 ST 0.0 0.9 10 SSW  Cloudy
13th
12.4 23.7 23.6 49 12.2 5.8 1018.2 FS 0.0 1.8 14 SW  Sunny pm
14th
14.2 24.4 23.1 37 7.6 7.2 1016.6 FS 0.0 1.2 11 SSW  Sunny
15th
13.7 23.2 17.7 67 11.5 3.8 1013.1 FS 1.0 1.3 17 SE  Thunder pm.
16th
11.1 23.2 21.3 43 8.2 6.3 1022.4 ST 0.0 1.7 14 SW  Sunny spells
17th
9.4 22.6 22.3 46 10.1 4.7 1015.0 F 0.0 3.0 20 SW  Cloudy
18th
11.3 19.2 18.4 47 6.9 2.8 1017.0 FS 0.0 2.3 14 SSW  Cloudy
19th
10.9 19.7 19.0 39 4.7 4.7 1020.5 FS 0.0 2.4 18 N  N/K
20th
11.6 19.1 18.8 50 8.2 2.7 1022.3 FS 0.0 1.6 11 SSW  N/K
21st
10.4 22.1 20.2 46 8.2 3.0 1023.0 FS 0.0 0.9 10 N  N/K
22nd
12.8 22.1 20.7 49 9.6 2.8 1026.7 FS 0.0 0.6 8 SE  N/K
23rd
11.3 24.6 24.5 37 8.8 9.3 1026.6 FS 0.0 1.0 16 SE  N/K
24th
13.9 23.9 23.8 35 7.4 7.5 1019.0 F 0.0 1.4 16 SW  N/K
25th
15.3 26.7 26.3 45 13.4 8.0 1011.6 FS 0.0 1.2 12 N  N/K
26th
14.5 23.7 23.6 59 15.1 3.8 1010.6 ST 1.0 0.9 11 SW  N/K
27th
13.4 27.5 26.6 34 9.4 8.7 1014.1 ST 0.0 1.1 16 SW  N/K
28th
18.4 27.1 24.7 40 10.2 4.0 1014.7 ST 0.0 0.6 10 N  N/K
29th
14.4 30.3 29.0 41 14.4 8.3 1017.3 ST 0.0 0.9 17 SE  Sunny
30th
15.1 30.6 30.3 40 15.2 9.3 1020.7 ST 0.0 0.7 10 SE  Sunny
                         
‡ 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
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