Monthly Climate Summary for   May   2009  at Luton (Cranleigh Gardens)
                          home daily
                                    A rather changeable month with a warm sunny finish                                back forward
                         
Overall mean temperature was 13.1 ēC which is +1.5 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 18.4 ēC which is +1.9 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 18.5 ēC                
Mean 24hr minimum (09-09) was 7.8 ēC                
  Highest day max was 24.3 ēC on  the   29                 
  Lowest day max was 11.9 ēC on  the 4            
  Highest night min was 12.9 ēC on  the 28            
  Lowest night min was 2.6 ēC on  the 4            
  Lowest grass min was -2.7 ēC on  the 4            
                         
Total rainfall this month was 24.8 mm which is 46.6 per  cent of the 1971-2000 average    
  Highest daily fall was 6.1 mm on  the 25            
Number of hours with rain was                    
Equiv. TSR rainfall duration was 19.0 hrs which is 64.2 per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration 4.0 hrs on  the 30            
  Mean rainfall intensity 1.31 mm/hr                
                         
Total CS sunshine this month was 226.2 hrs which is 122.4 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 14.9 hrs on  the 30            
                         
Maximum  snow depth  was 0.0 cm on  the               
                         
Mean sea-level pressure at 09Z 1017.4 mbar which is +2.3 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1031.6 mbar on  the 29            
  Lowest  pressure at 09Z 1000.4 mbar on  the 15            
                         
Number of days with:                      
Air Frost 0   0.2mm rain 11   No  sun 0   Snow lying 0    
Grnd Frost 2   1.0mm 7   3h  sun 26   Snow/sleet 0    
Max < 0ēC 0   5mm 2   6h  sun 21   Hail 0    
Max > 10 31   10mm 0   9h  sun 9   Thunder 0    
Max > 20 8   25mm 0   12h sun 5   Fog at 09Z 0    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month: