Monthly Climate Summary for September 2009  at Luton (Cranleigh Gardens)
                          home daily
                                                  Cool unsettled start, otherwise dry and rather warm                               back forward
                         
Overall mean temperature was 14.6 ēC which is +0.5 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 19.1 ēC which is +0.7 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 10.1 ēC which is +0.4 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 19.1 ēC                
Mean 24hr minimum (09-09) was 10.1 ēC                
  Highest day max was 26.6 ēC on  the   8                 
  Lowest day max was 15.4 ēC on  the 17            
  Highest night min was 17.1 ēC on  the 8            
  Lowest night min was 5.1 ēC on  the 27            
  Lowest grass min was 1.3 ēC on  the 10            
                         
Total rainfall this month was 13.0 mm which is 20.3 per  cent of the 1971-2000 average    
  Highest daily fall was 8.3 mm on  the 2            
Number of hours with rain was                    
TSR rainfall duration was 8.0 hrs which is 19.7 per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration 5.0 hrs on  the 2            
  Mean rainfall intensity 1.63 mm/hr                
                         
Total CS sunshine this month was 136.4 hrs which is 99.9 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 9.1 hrs on  the 25            
                         
Maximum  snow depth  was 0.0 cm on  the               
                         
Mean sea-level pressure at 09Z 1022.8 mbar which is +6.4 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1038.6 mbar on  the 11            
  Lowest  pressure at 09Z 998.0 mbar on  the 3            
                         
Number of days with:                      
Air Frost 0   0.2mm rain 6   No  sun 2   Snow lying 0    
Grnd Frost 0   1.0mm 2   3h  sun 21   Snow/sleet 0    
Max < 0ēC 0   5mm 1   6h  sun 11   Hail 0    
Max > 10 30   10mm 0   9h  sun 2   Thunder 0    
Max > 20 8   25mm 0   12h sun 0   Fog at 09Z 0    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month: