Monthly Climate Summary for September 2009 at Whipsnade (The Lodge)
                          home daily
                  Disturbed windy start, then dry and rather warm with some sunny days        back forward
                         
Overall mean temperature was 13.8 ēC which is +0.5 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 18.0 ēC which is +0.8 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 9.6 ēC which is +0.3 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 18.0 ēC                
Mean 24hr minimum (09-09) was 9.6 ēC                
  Highest day max was 24.5 ēC on  the   8            
  Lowest day max was 14.8 ēC on  the 17            
  Highest night min was 15.6 ēC on  the 8            
  Lowest night min was 4.4 ēC on  the 27            
  Lowest grass min was -0.3 ēC on  the 27            
                         
Total rainfall this month was 15.8 mm which is 27.7 per  cent of the 1971-2000 average    
  Highest daily fall was 11.9 mm on  the 2            
Number of hours with rain was                    
Equiv. TSR rainfall duration was   hrs which is   per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration   hrs on  the              
  Mean rainfall intensity   mm/hr                
                         
Total CS sunshine this month was 155.5 hrs which is 113.9 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 11.0 hrs on  the 25            
                         
Maximum  snow depth  was 0.0 cm on  the               
                         
Mean sea-level pressure at 09Z 1022.9 mbar which is +6.5 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1038.5 mbar on  the 11            
  Lowest  pressure at 09Z 998.4 mbar on  the 3            
                         
Number of days with:                      
Air Frost 0   0.2mm rain 9   No  sun 2   Snow lying 0    
Grnd Frost 1   1.0mm 2   3h  sun 22   Snow/sleet 0    
Max < 0ēC 0   5mm 1   6h  sun 15   Hail 0    
Max > 10 30   10mm 1   9h  sun 5   Thunder 0    
Max > 20 2   25mm 0   12h sun 0   Fog at 09Z 0    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month: