Monthly Climate Summary for  July  2009  at Hampstead  
                        home daily
                   Hot start, then very unsettled from the 6th with near normal temperature   back forward
                       
Overall mean temperature was 17.1 ēC which is -0.3 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 21.2 ēC              
Mean night minimum (21-09) was 12.9 ēC              
Mean 24hr maximum (09-09) was 21.2 ēC which is -0.8 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 12.9 ēC which is +0.2 degC compared with the 1971-2000 average
  Highest day max was 27.9 ēC on  the   2          
  Lowest day max was 18.1 ēC on  the 9          
  Highest night min was 18.0 ēC on  the 3          
  Lowest night min was 9.4 ēC on  the 10          
  Lowest grass min was 5.4 ēC on  the 9          
                       
Total rainfall this month was 77.2 mm which is 164.3 per  cent of the 1971-2000 average  
  Highest daily fall was 12.5 mm on  the 24          
Number of hours with rain was 94.0 hrs              
Equiv. TSR rainfall duration was 65.8 hrs which is 235.0 per  cent of the 1971-2000 average  
  Highest no of wet hrs 12.0 hrs on  the 11          
  Highest equiv duration 10.0 hrs on  the 11          
Mean Rainfall Intensity 1.17 mm/h              
                       
Total sunshine this month was 156.3 hrs which is 89.1 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 172.0 hrs which is 89.1 per  cent of the 1971-2000 average  
  Highest daily sun was 11.6 hrs on  the 2          
                       
Maximum  snow depth  was 0.0 cm              
                       
Mean sea-level pressure at 09Z 1013.7 mbar which is -3.7 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1024.7 mbar on  the 1          
  Lowest  pressure at 09Z 1004.1 mbar on  the 23          
                       
Number of days with:                    
Air Frost 0   >0.2mm rain 22   No  sun 0   Snow lying 0  
Grnd Frost 0   >1.0mm 14   3h  sun 22   Snow/sleet 0  
Max < 0ēC 0   >   5mm 6   6h  sun 11   Hail 0  
Max > 10 31   > 10mm 2   9h  sun 1   Thunder 2  
Max > 20 23   > 25mm 0   12h sun 0   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month: