Monthly Climate Summary for  May  2010  at Hampstead  
                        home daily
                            A cold month, apart from a warm spell 19th-25th   back forward
                       
Overall mean temperature was 11.6 ēC which is -0.4 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 16.1 ēC              
Mean night minimum (21-09) was 7.0 ēC              
Mean 24hr maximum (09-09) was 16.2 ēC which is -0.1 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 7.0 ēC which is -0.6 degC compared with the 1971-2000 average
  Highest day max was 28.0 ēC on  the   24          
  Lowest day max was 8.0 ēC on  the 2          
  Highest night min was 14.0 ēC on  the 24          
  Lowest night min was 1.2 ēC on  the 12          
  Lowest grass min was -5.5 ēC on  the 12          
                       
Total rainfall this month was 85.4 mm which is 144.7 per  cent of the 1971-2000 average  
  Highest daily fall was 62.5 mm on  the 1          
Number of hours with rain was 35.0 hrs              
Equiv. TSR rainfall duration was 24.5 hrs which is 68.1 per  cent of the 1971-2000 average  
  Highest no of wet hrs 9.0 hrs on  the 29          
  Highest equiv duration 7.5 hrs on  the 29          
Mean rainfall intensity 3.48 mm/h              
                       
Total sunshine this month was 162.8 hrs which is 90.4 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 179.0 hrs which is 90.4 per  cent of the 1971-2000 average  
  Highest daily sun was 12.3 hrs on  the 23          
                       
Maximum  snow depth  was 0.0 cm on the            
                       
Mean sea-level pressure at 09Z 1018.4 mbar which is +3.2 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1033.4 mbar on  the 20          
  Lowest  pressure at 09Z 1010.2 mbar on  the 1          
                       
Number of days with:                    
Air Frost 0   0.2mm rain 10   No  sun 1   Snow lying 0  
Grnd Frost 7   1.0mm 5   3h  sun 24   Snow/sleet 0  
Max < 0ēC 0   5mm 2   6h  sun 10   Hail 0  
Max > 10 28   10mm 2   9h  sun 4   Thunder 0  
Max > 20 5   25mm 1   12h sun 2   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month:                 
Torrential downpour 1st/2nd; 65.8mm fell in the 24h beginning 14z on the 1st