Monthly Climate Summary for  June  2009  at Hampstead  
                        home daily
               Alternating warm and cool spells; several heavy thundery downpours   back forward
                       
Overall mean temperature was 16.0 ēC which is +0.9 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 20.8 ēC              
Mean night minimum (21-09) was 11.2 ēC              
Mean 24hr maximum (09-09) was 20.8 ēC which is +0.9 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 11.2 ēC which is +0.8 degC compared with the 1971-2000 average
  Highest day max was 28.4 ēC on  the   29          
  Lowest day max was 12.3 ēC on  the 5          
  Highest night min was 16.4 ēC on  the 29          
  Lowest night min was 5.9 ēC on  the 4          
  Lowest grass min was -0.2 ēC on  the 4          
                       
Total rainfall this month was 111.8 mm which is 189.4 per  cent of the 1971-2000 average  
  Highest daily fall was 33.2 mm on  the 27          
Number of hours with rain was 51.0 hrs              
Equiv. TSR rainfall duration was 35.7 hrs which is 108.2 per  cent of the 1971-2000 average  
  Highest no of wet hrs 11.0 hrs on  the 5          
  Highest equiv duration 9.1 hrs on  the 5          
Mean Rainfall Intensity 3.13 mm/h              
                       
Total sunshine this month was 179.5 hrs which is 99.2 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 197.4 hrs which is 99.2 per  cent of the 1971-2000 average  
  Highest daily sun was 12.2 hrs on  the 2          
                       
Maximum  snow depth  was 0.0 cm              
                       
Mean sea-level pressure at 09Z 1018.9 mbar which is +2.0 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1030.3 mbar on  the 23          
  Lowest  pressure at 09Z 1001.4 mbar on  the 7          
                       
Number of days with:                    
Air Frost 0   0.2mm rain 11   No  sun 1   Snow lying 0  
Grnd Frost 1   1.0mm 7   3h  sun 24   Snow/sleet 0  
Max < 0ēC 0   5mm 5   6h  sun 15   Hail 0  
Max > 10 30   10mm 4   9h  sun 7   Thunder 2  
Max > 20 17   25mm 2   12h sun 1   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month:                 
Severe thunderstorm on the 27th; 22.7mm fell in 30min (1650-1720z), and 29.7mm in 65min (1625-1730z)