Monthly Climate Summary for   May   2011  at Luton (Cranleigh Gardens)
                          home daily
                   A third successive dry month;  very warm and quite sunny first ten days                      back forward
                         
Overall mean temperature was 13.4 ēC which is 1.8 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 18.8 ēC which is +2.3 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 7.9 ēC which is 1.2 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 18.8 ēC                
Mean 24hr minimum (09-09) was 7.9 ēC                
  Highest day max was 24.7 ēC on  the   6                 
  Lowest day max was 14.1 ēC on  the 15            
  Highest night min was 14.5 ēC on  the 8            
  Lowest night min was 1.7 ēC on  the 4            
  Lowest grass min was -2.8 ēC on  the 4            
                         
Total rainfall this month was 18.7 mm which is 35.2 per  cent of the 1971-2000 average    
  Highest daily fall was 6.1 mm on  the 7            
Number of hours with rain was                    
Equiv. TSR rainfall duration was 22.7 hrs which is 76.7 per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration 7.5 hrs on  the 24            
  Mean rainfall intensity 0.82 mm/hr                
                         
Total CS sunshine this month was 224.3 hrs which is 121.4 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 13.9 hrs on  the 24            
                         
Maximum  snow depth  was 0.0 cm on  the               
                         
Mean sea-level pressure at 09Z 1018.0 mbar which is +2.9 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1026.1 mbar on  the 15            
  Lowest  pressure at 09Z 1004.8 mbar on  the 26            
                         
Number of days with:                      
Air Frost 0   0.2mm rain 9   No  sun 0   Snow lying 0    
Grnd Frost 1   1.0mm 6   3h  sun 23   Snow/sleet 0    
Max < 0ēC 0   5mm 1   6h  sun 17   Hail 0    
Max > 10 31   10mm 0   9h  sun 14   Thunder 0    
Max > 20 10   25mm 0   12h sun 7   Fog at 09Z 0    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month: