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 ēC which is +1.0 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 22.6 ēC which is +0.7 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 13.2 ēC which is +1.4 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 22.7 ēC                
Mean 24hr minimum (09-09) was 13.2 ēC                
  Highest day max was 28.1 ēC on  the   19                 
  Lowest day max was 18.7 ēC on  the 30            
  Highest night min was 17.4 ēC on  the 5            
  Lowest night min was 8.4 ēC on  the 22            
  Lowest grass min was 4.5 ēC 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 < 0ēC 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