Monthly Climate Summary for August  2011 at Hampstead  
                        home daily
                                    Very warm start then mostly cool and unsettled     back forward
                       
Overall mean temperature was 16.5 ēC which is -0.8 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 20.5 ēC              
Mean night minimum (21-09) was 12.6 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 12.6 ēC which is -0.1 degC compared with the 1971-2000 average
  Highest day max was 28.3 ēC on  the   3          
  Lowest day max was 14.9 ēC on  the 23          
  Highest night min was 17.0 ēC on  the 3          
  Lowest night min was 8.6 ēC on  the 19          
  Lowest grass min was 4.1 ēC on  the 10          
                       
Total rainfall this month was 85.6 mm which is 182.2 per  cent of the 1971-2000 average  
  Highest daily fall was 16.6 mm on  the 18          
Number of hours with rain was 67.0 hrs              
Equiv. TSR rainfall duration was 46.9 hrs which is 167.5 per  cent of the 1971-2000 average  
  Highest no of wet hrs 9.0 hrs on  the 25          
  Highest equiv duration 7.5 hrs on  the 25          
Mean Rainfall Intensity 1.83 mm/h              
                       
Total sunshine this month was 133.5 hrs which is 76.1 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 146.9 hrs which is 76.1 per  cent of the 1971-2000 average  
  Highest daily sun was 9.6 hrs on  the 1          
                       
Maximum  snow depth  was 0.0 cm              
                       
Mean sea-level pressure at 09Z 1014.6 mbar which is -2.8 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1024.2 mbar on  the 10          
  Lowest  pressure at 09Z 1004.1 mbar on  the 26          
                       
Number of days with:                    
Air Frost 0   >0.2mm rain 19   No  sun 3   Snow lying 0  
Grnd Frost 0   >1.0mm 15   3h  sun 19   Snow/sleet 0  
Max < 0ēC 0   >   5mm 6   6h  sun 10   Hail 0  
Max > 10 31   > 10mm 3   9h  sun 3   Thunder 0  
Max > 20 18   > 25mm 0   12h sun 0   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month: