Monthly Climate Summary for  May  2009  at Whipsnade (Lodge)
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                                A rather changeable month with a warm sunny finish       back forward
                         
Overall mean temperature was 11.6 ēC which is +0.9 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 16.5 ēC which is +1.2 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 6.7 ēC which is +0.5 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 16.7 ēC                
Mean 24hr minimum (09-09) was 6.6 ēC                
  Highest day max was 22.8 ēC on  the   29            
  Lowest day max was 10.7 ēC on  the 4            
  Highest night min was 11.8 ēC on  the 28            
  Lowest night min was -0.4 ēC on  the 4            
  Lowest grass min was -4.3 ēC on  the 4            
                         
Total rainfall this month was 30.3 mm which is 55.1 per  cent of the 1971-2000 average    
  Highest daily fall was 11.0 mm on  the 14            
Number of hours with rain was                    
Equiv. TSR rainfall duration was 23.2 hrs which is   per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration 5.8 hrs on  the 25            
  Mean rainfall intensity 1.31 mm/hr                
                         
Total CS sunshine this month was 235.4 hrs which is 127.4 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 14.8 hrs on  the 24            
                         
Maximum  snow depth  was 0.0 cm on  the  22            
                         
Mean sea-level pressure at 09Z 1018.4 mbar which is +3.3 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1032.9 mbar on  the 29            
  Lowest  pressure at 09Z 1000.5 mbar on  the 15            
                         
Number of days with:                      
Air Frost 1   0.2mm rain 11   No  sun 0   Snow lying 0    
Grnd Frost 3   1.0mm 9   3h  sun 25   Snow/sleet 0    
Max < 0ēC 0   5mm 2   6h  sun 20   Hail 0    
Max > 10 31   10mm 1   9h  sun 11   Thunder 0    
Max > 20 7   25mm 0   12h sun 7   Fog at 09Z 0    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month: