Monthly Climate Summary for September 2010  at Hampstead
                        home daily
                  A changeable month with a rather cold, cloudy and wet last week   back forward
                       
Overall mean temperature was 14.3 ēC which is -0.1 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 17.9 ēC              
Mean night minimum (21-09) was 10.7 ēC              
Mean 24hr maximum (09-09) was 17.9 ēC which is -0.4 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 10.6 ēC which is +0.2 degC compared with the 1971-2000 average
  Highest day max was 22.7 ēC on  the   22          
  Lowest day max was 12.6 ēC on  the 24          
  Highest night min was 15.4 ēC on  the 11          
  Lowest night min was 4.3 ēC on  the 25          
  Lowest grass min was 1.4 ēC on  the 18          
                       
Total rainfall this month was 52.4 mm which is 79.3 per  cent of the 1971-2000 average  
  Highest daily fall was 13.6 mm on  the 6          
Number of hours with rain was 55.0 hrs              
Equiv. TSR rainfall duration was 38.5 hrs which is 104.1 per  cent of the 1971-2000 average  
  Highest no of wet hrs 11.0 hrs on  the 6          
  Highest equiv duration 9.1 hrs on  the 6          
Mean Rainfall Intensity 1.36 mm/h              
                       
Total sunshine this month was 104.6 hrs which is 80.1 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 115.0 hrs which is 80.1 per  cent of the 1971-2000 average  
  Highest daily sun was 9.8 hrs on  the 1          
                       
Maximum  snow depth  was 0.0 cm              
                       
Mean sea-level pressure at 09Z 1016.5 mbar which is -0.2 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1027.3 mbar on  the 13          
  Lowest  pressure at 09Z 1002.4 mbar on  the 7          
                       
Number of days with:                    
Air Frost 0   0.2mm rain 12   No  sun 1   Snow lying 0  
Grnd Frost 0   1.0mm 8   3h  sun 15   Snow/sleet 0  
Max < 0ēC 0   5mm 4   6h  sun 6   Hail 0  
Max > 10 30   10mm 2   9h  sun 2   Thunder 0  
Max > 20 7   25mm 0   12h sun 0   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month: