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graphs CLIMATE-UK.COM'S REVIEW OF THE BRITISH METEOROLOGICAL SCENE
MONTHLY SUMMARY
No. 620 For AUGUST 2007
A RATHER COOL MONTH; DRY AND BRIGHT EARLY AND LATE, BUT DULL AND WET MID-MONTH
Text Box: Pressure was relatively high across southern Britain until the 11th but a changeably westerly flow affected Scotland. Between the 11th and 20th the weather was often cyclonic, then, following a few days of north-easterlies, an anticyclonic/north-westerly type prevailed from the 25th onwards. Over the entire month, mean sea-level pressure ranged from 2mbar below normal in Shetland to 2mbar below in western Ireland, and it was the equal-fourth most northerly August in 135 years of records.

Relatively high pressure maintained generally fine weather over much of England and Wales until the 11th and it was very warm from the 3rd to the 5th with highs of 23-27C, peaking at 29.7C on the 5th at Coningsby and Holbeach (both Lincs). Nights were generally cool during this period, but that of 3rd/4th was very warm in northeast England, and Linton-on-Ouse (North Yorks) logged a minimum that night of 18.4C. There were scattered showers and local thunderstorms on the 5th and 6th, but many places stayed dry throughout this period, and Portland (Dorset) recorded a total of 130 hours of bright sunshine over the eleven days. By contrast, the weather in Scotland and Northern Ireland was quite disturbed during the first week with frequent rain and blustery winds: 52mm fell at Fyvie (Aberdeenshire) on the 4th and 55mm at Stornoway (Western Isles) on the 5th, and Stornoway also recorded a peak gust of 54kn on the 7th.

A deepening depression tracked northeast across Ireland and Scotland on the 12th/13th, a vigorous depression followed a similar path on the 14th followed by a couple of days of northwesterly winds, a third depression tracked slowly east across central Ireland and northern England on the 18th/19th, while a fourth travelled south-eastwards across Wales and southwest England on the 20th. The weather during this period was rather cool and unsettled in all regions with frequent rain, heavy in places, fresh to strong winds at times, and a shortage of sunshine. Local flooding Text Box: followed storms in Norwich district on the 19th, around Torbay on the 20th and in Folkestone on the 21st. A cold north to north-easterly flow in the wake of one of the depressions resulted in notably low maxima on the 19th including 10.1C at Carterhouse (Roxburghshire) and 10.6C at Okehampton (Devon), and there was a widespread ground frost the following night in Scotland with a lowest air minimum of 0.9C at Tulloch Bridge (Lochaber). From the 21st-24th a north-easterly airflow brought cold and cloudy weather to much of eastern England  Wattisham (Suffolk) recorded five consecutive days with no sunshine starting on the 20th, and a limited search suggests that this may be without precedent in lowland Britain in August  while western and northern parts of the UK were very warm at times with long sunny spells. 

From the 25th until the end of the month a large anticyclone was centred just west or southwest of Ireland, maintaining generally dry weather although northern and western Scotland were more changeable. It was very warm over England and Wales on the 25th with 28.0C at Shobdon (Herefs), but temperatures fell away during the remaining days of the month and sunshine was variable rather than plentiful.

Both mean maximum and mean minimum temperature for the month were between 0 and 1degC below the respective 1971-2000 averages, and over much of the UK it was the coolest August since 1993. Rainfall was above average over most of Scotland, Northern Ireland, northwest England and also parts of the East Anglia and the Southeast, but it was a dry August elsewhere; a large part of the southwest Midlands received less than 30mm. Sunshine totals were 10-30% below normal in parts of Scotland, Northern Ireland, northwest England, East Anglia and Kent, but up to 25% above locally in northeast England, the Midlands, and the West Country.
                                                                                                                                             
    TEMPERATURE   SUNSHINE   RAINFALL        
                                                                                                                                     
                                                                                                                                     
                                  Highest and lowest totals             Highest and lowest totals        
                                  on record for month    
Maximum fall in 24 hrs
   (beginning 09 h)
        on record for month    
Days with snow or sleet
 
Days with fog
(Vis <220 yards at 09 h)
 
                                                                                         
     
Difference from average
   
Difference from average
 
Highest maximum
   
Lowest minimum
   
No. of days with grass
  minimum below 0C
   
Days of no sunshine
 
Maximum duration
       
First year of record
         
Days of no rainfall
 (0.1 mm or less)
         
First year of record
         
Days with thunder
     
  PLACE  
Mean Maximum
   
Mean minimum
             
No. of air frosts
       
Total for month
                   
Total for month
                   
                               
% of average
                   
% of average
                 
                                                                     
                                   
Highest
   
Lowest
 
Year
             
Highest
   
Lowest
 
Year
       
             
Date
   
Date
         
Date
         
Year
         
Date
         
Year
           
                                                                     
    C     C     C     C           Hrs     Hrs       Hrs     Hrs       mm     mm       mm     mm          
                                                                                                                                             
  *Hampstead   20.6   -0.5   12.2   -0.6   28.9   05   09.2   17   00   00   04   11.5   04   162   094   1910   282   1995   104   1958   16   12.8   18   055   076   1910   184   1975   02   1995   00   00   00  
  Thorney Island   20.3   -1.5   12.5   -0.9   24.2   05   08.8   01   00   00   02   13.3   05   222   114   1958   303   1976   143   1968   14   15.4   14   054   101   1941   141   1960   04   1976   01   00   00  
  *Wattisham   20.5   -0.5   11.3   -0.3   27.0   05   07.2   17   00   00   06   12.8   05   156   091   1968   285   1995   131   2006   16   16.4   19   044   080   1960   130   2006   03   2003   02   00   00  
  *Wittering   20.7   +0.3   11.3   -0.7   28.7   05   08.1   27   00   00   02   13.0   05   191   112   1950   258   1995   090   1971   19   16.8   15   039   061   1948   162   2004   03   1983   01   00   00  
                                                                     
  Lyneham   20.1   -0.3   11.3   -0.6   27.1   05   08.1   30   00   00   00   13.6   11   227   126   1952   297   1995   125   1958   17   16.8   15   045   066   1945   136   1951   02   1995   01   00   00  
  Ross-on-Wye   21.1   +0.2   11.4   -0.8   28.0   05   07.0   08   00   00   01   12.4   06   201   124   1915   307   1995   107   1922   22   12.3   15   033   051   1859   202   1878   04   1936   01   00   00  
  *St Athan   19.8   -0.3   12.2   -0.3   25.3   23   08.4   20   00   00   00   13.2   09   194   103   1954   325   1995   133   1958   16   19.5   01   073   084   1954   202   1997   22   1955   00   00   00  
  St Mawgan   18.8   -0.3   13.1   -0.1   22.9   05   10.6   11   00   00   00   13.4   09   243   125   1945   323   1976   125   1958   15   15.2   19   057   078   1944   189   1958   04   1981   00   00   00  
                                                                     
  *Edgbaston   19.9   -1.0   12.4   -0.4   26.8   05   09.6   16   00   00   01   12.1   08   184   115   1887   282   1995   085   1896   21   10.4   14   035   063   1887   173   1912   06   1940   02   00   00  
  *Valley   17.8   -1.1   12.8   +0.1   20.5   22   08.0   08   00   00   03   12.7   26   159   087   1946   291   1976   123   1948   14   15.6   14   059   085   1941   210   1956   05   1959   00   00   00  
  *Woodford   19.4   -0.3   10.6   -0.6   26.1   05   04.6   08   01   00   02   11.8   22   144   093   1945   284   1995   089   1948   16   07.6   18   033   040   1942   201   1956   07   1976   01   00   00  
  *Watnall   20.3   0.0   11.7   -0.3   28.0   05   08.5   27   00   00   01   12.9   10   185   109   1948   261   1995   098   1963   21   09.0   14   034   052   1942   154   2004   04   1995   02   00   00  
                                                                     
  *Leeming   19.9   -0.1   10.7   -0.7   27.5   05   07.2   17   00   00   04   13.8   08   207   138   1945   246   1995   086   1954   22   12.2   14   040   044   1945   165   1971   07   1947   01   00   00  
  *Boulmer   18.1   +0.2   10.6   -0.8   24.1   24   07.0   09   00   00   03   13.8   08   149   099   1945   273   1995   096   2004   20   11.8   14   032   041   1945   199   1956   03   1947   00   00   00  
  *Eskdalemuir   17.4   -0.2   08.8   -0.3   22.9   23   03.7   02   00   00   04   13.3   22   108   081   1911   260   1947   044   1912   11   22.0   04   125   102   1911   345   1985   01   1947   01   00   00  
  *Bishopton   18.2   -0.8   10.8   +0.3   25.5   22   05.6   20   00   00   03   13.0   22   118   082   1921   254   1995   085   1942   11   38.6   18   129   156   1921   213   2004   00   1947   00   00   00  
                                                                     
  *Leuchars   18.2   -0.3   10.3   -0.3   22.5   24   06.7   08   00   00   04   13.6   22   161   102   1922   242   1995   097   1963   14   34.6   18   080   116   1922   213   2004   07   1955   00   00   00  
  *Dyce   17.5   -0.4   10.3   +0.3   25.8   24   04.3   28   01   00   02   12.9   08   120   083   1941   257   1947   076   1963   12   41.8   05   084   105   1941   162   1962   00   1947   00   00   00  
  *Stornoway   15.8   -0.3   10.4   +0.3   19.6   13   05.5   14   00   00   04   08.7   11   069   051   1880   262   1899   065   2006   03   54.8   06   132   179   1943   203   1982   13   1947   00   00   00  
  *Aldergrove   17.8   -0.6   11.7   +0.8   21.5   03   08.4   08   00   00   05   09.6   07   098   072   1927   276   1976   082   1942   13   26.2   11   082   106   1927   161   1956   09   1947   00   00   00  
 
                                                                                                                                             
  Stations marked with an asterisk record sunshine electronically; comparisons      
  with earlier records are therefore somewhat speculative. Thorney Island's      
  sunshine figures are from a nearby site.