Monthly Climate Summary for September 2007  at Luton (Cranleigh Gardens)
                          home daily
                            Dry, rather warm and quite sunny until the 22nd;  cool and changeable thereafter                            back forward
                         
Overall mean temperature was 14.3 ēC which is +0.2 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 18.7 ēC which is +0.3 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 9.8 ēC which is +0.1 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 18.7 ēC                
Mean 24hr minimum (09-09) was 9.8 ēC                
  Highest day max was 23.3 ēC on  the   5                 
  Lowest day max was 11.8 ēC on  the 26            
  Highest night min was 14.4 ēC on  the 7            
  Lowest night min was 2.8 ēC on  the 30            
  Lowest grass min was 0.1 ēC on  the 30            
                         
Total rainfall this month was 30.4 mm which is 47.4 per  cent of the 1971-2000 average    
  Highest daily fall was 12.1 mm on  the 23            
Number of hours with rain was                    
TSR rainfall duration was 19.8 hrs which is 48.6 per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration 5.3 hrs on  the 23            
  Mean rainfall intensity 1.54 mm/hr                
                         
Total CS sunshine this month was 146.9 hrs which is 107.6 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 18            
                         
Maximum  snow depth  was 0.0 cm on  the               
                         
Mean sea-level pressure at 09Z 1021.8 mbar which is 5.4 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1032.9 mbar on  the 7            
  Lowest  pressure at 09Z 1005.8 mbar on  the 24            
                         
Number of days with:                      
Air Frost 0   0.2mm rain 12   No  sun 2   Snow lying 0    
Grnd Frost 0   1.0mm 5   3h  sun 20   Snow/sleet 0    
Max < 0ēC 0   5mm 2   6h  sun 11   Hail 0    
Max > 10 30   10mm 1   9h  sun 6   Thunder 0    
Max > 20 14   25mm 0   12h sun 0   Fog at 09Z 0    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month: