Monthly Climate Summary for  May  2011  at Hampstead  
                        home daily
                  A third successive dry month;   very warm and quite sunny till the 10th   back forward
                       
Overall mean temperature was 13.4 ēC which is +1.4 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 18.1 ēC              
Mean night minimum (21-09) was 8.6 ēC              
Mean 24hr maximum (09-09) was 18.2 ēC which is +1.9 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 8.6 ēC which is +1.0 degC compared with the 1971-2000 average
  Highest day max was 24.2 ēC on  the   6          
  Lowest day max was 14.0 ēC on  the 3          
  Highest night min was 13.6 ēC on  the 8          
  Lowest night min was 2.7 ēC on  the 4          
  Lowest grass min was -2.3 ēC on  the 25          
                       
Total rainfall this month was 26.1 mm which is 44.2 per  cent of the 1971-2000 average  
  Highest daily fall was 12.5 mm on  the 26          
Number of hours with rain was 30.0 hrs              
Equiv. TSR rainfall duration was 21.0 hrs which is 58.3 per  cent of the 1971-2000 average  
  Highest no of wet hrs 6.0 hrs on  the 30          
  Highest equiv duration 5.0 hrs on  the 30          
Mean rainfall intensity 1.24 mm/h              
                       
Total sunshine this month was 195.7 hrs which is 108.7 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 215.2 hrs which is 108.7 per  cent of the 1971-2000 average  
  Highest daily sun was 12.0 hrs on  the 25          
                       
Maximum  snow depth  was 0.0 cm on the            
                       
Mean sea-level pressure at 09Z 1019.2 mbar which is +4.0 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1026.9 mbar on  the 10          
  Lowest  pressure at 09Z 1006.9 mbar on  the 26          
                       
Number of days with:                    
Air Frost 0   0.2mm rain 11   No  sun 0   Snow lying 0  
Grnd Frost 5   1.0mm 7   3h  sun 24   Snow/sleet 0  
Max < 0ēC 0   5mm 1   6h  sun 18   Hail 1  
Max > 10 31   10mm 1   9h  sun 9   Thunder 1  
Max > 20 7   25mm 0   12h sun 1   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month: