Monthly Climate Summary for August 2009 at Luton (Cranleigh Gardens)
                          home daily
Changeable but rather warm; long dry periods separated by occasional downpours back forward
                         
Overall mean temperature was 17.9 C which is +1.0 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 22.6 C which is +0.7 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 13.2 C which is +1.4 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 22.7 C                
Mean 24hr minimum (09-09) was 13.2 C                
  Highest day max was 28.1 C on the 19            
  Lowest day max was 18.7 C on the 30            
  Highest night min was 17.4 C on the 5            
  Lowest night min was 8.4 C on the 22            
  Lowest grass min was 4.5 C on the 22            
                         
Total rainfall this month was 87.4 mm which is 172.7 per cent of the 1971-2000 average    
  Highest daily fall was 36.9 mm on the 6            
Number of hours with rain was                    
TSR rainfall duration was 24.2 hrs which is 64.7 per cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on the              
  Highest duration 8.0 hrs on the 6            
  Mean rainfall intensity 3.61 mm/hr                
                         
Total CS sunshine this month was 181.1 hrs which is 97.9 per cent of the 1971-2000 average    
Equiv. C/S sunshine total was   hrs which is   per cent of the 1971-2000 average    
  Highest daily sun was 10.8 hrs on the 23            
                         
Maximum snow depth was 0.0 cm on the              
                         
Mean sea-level pressure at 09Z 1016.0 mbar which is -0.1 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1023.9 mbar on the 22            
  Lowest pressure at 09Z 1006.2 mbar on the 24            
                         
Number of days with:                      
Air Frost 0   0.2mm rain 11   No sun 0   Snow lying 0    
Grnd Frost 0   1.0mm 10   3h sun 23   Snow/sleet 0    
Max < 0C 0   5mm 4   6h sun 16   Hail 1    
Max > 10 31   10mm 3   9h sun 6   Thunder 1    
Max > 20 27   25mm 1   12h sun 0   Fog at 09Z 0    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month:                  
On the 25th heavy rain amounted to 16.6mm in 20 minutes between 1520 and 1540z