Monthly Climate Summary for  July  2011  at Hampstead  
                        home daily
                  Dry, rather warm start and finish, otherwise cool and changeable       back forward
                       
Overall mean temperature was 16.1 ēC which is -1.3 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 20.5 ēC              
Mean night minimum (21-09) was 11.6 ēC              
Mean 24hr maximum (09-09) was 20.5 ēC which is -1.5 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 11.6 ēC which is -1.1 degC compared with the 1971-2000 average
  Highest day max was 24.9 ēC on  the   5          
  Lowest day max was 16.8 ēC on  the 13          
  Highest night min was 14.8 ēC on  the 4          
  Lowest night min was 9.0 ēC on  the 24          
  Lowest grass min was 4.3 ēC on  the 30          
                       
Total rainfall this month was 59.8 mm which is 127.3 per  cent of the 1971-2000 average  
  Highest daily fall was 14.0 mm on  the 18          
Number of hours with rain was 52.0 hrs              
Equiv. TSR rainfall duration was 36.4 hrs which is 130.0 per  cent of the 1971-2000 average  
  Highest no of wet hrs 8.0 hrs on  the 5          
  Highest equiv duration 6.6 hrs on  the 5          
Mean Rainfall Intensity 1.64 mm/h              
                       
Total sunshine this month was 155.2 hrs which is 88.4 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 170.7 hrs which is 88.4 per  cent of the 1971-2000 average  
  Highest daily sun was 11.2 hrs on  the 30          
                       
Maximum  snow depth  was 0.0 cm              
                       
Mean sea-level pressure at 09Z 1014.8 mbar which is -2.6 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1028.0 mbar on  the 1          
  Lowest  pressure at 09Z 994.4 mbar on  the 17          
                       
Number of days with:                    
Air Frost 0   >0.2mm rain 11   No  sun 0   Snow lying 0  
Grnd Frost 0   >1.0mm 11   3h  sun 19   Snow/sleet 0  
Max < 0ēC 0   >   5mm 4   6h  sun 15   Hail 0  
Max > 10 31   > 10mm 2   9h  sun 6   Thunder 0  
Max > 20 17   > 25mm 0   12h sun 0   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month: