Monthly Climate Summary for September 2008  at Hampstead
                        home daily
                         Dull and wet first half;  mainly dry and brighter second half   back forward
                       
Overall mean temperature was 14.2 ēC which is -0.2 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 17.5 ēC              
Mean night minimum (21-09) was 10.8 ēC              
Mean 24hr maximum (09-09) was 17.6 ēC which is -0.7 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 10.8 ēC which is +0.4 degC compared with the 1971-2000 average
  Highest day max was 20.3 ēC on  the   19          
  Lowest day max was 13.9 ēC on  the 30          
  Highest night min was 14.5 ēC on  the 11          
  Lowest night min was 8.0 ēC on  the 29          
  Lowest grass min was 3.5 ēC on  the 19          
                       
Total rainfall this month was 57.2 mm which is 86.7 per  cent of the 1971-2000 average  
  Highest daily fall was 19.8 mm on  the 5          
Number of hours with rain was 82.0 hrs              
Equiv. TSR rainfall duration was 57.4 hrs which is 155.1 per  cent of the 1971-2000 average  
  Highest no of wet hrs 14.0 hrs on  the 6          
  Highest equiv duration 11.6 hrs on  the 6          
Mean Rainfall Intensity 1.00 mm/h              
                       
Total sunshine this month was 107.6 hrs which is 82.5 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 118.4 hrs which is 82.5 per  cent of the 1971-2000 average  
  Highest daily sun was 8.7 hrs on  the 14          
                       
Maximum  snow depth  was 0.0 cm              
                       
Mean sea-level pressure at 09Z 1018.5 mbar which is +1.8 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1037.4 mbar on  the 26          
  Lowest  pressure at 09Z 995.5 mbar on  the 6          
                       
Number of days with:                    
Air Frost 0   0.2mm rain 15   No  sun 3   Snow lying 0  
Grnd Frost 0   1.0mm 11   3h  sun 16   Snow/sleet 0  
Max < 0ēC 0   5mm 4   6h  sun 8   Hail 0  
Max > 10 30   10mm 1   9h  sun 0   Thunder 0  
Max > 20 2   25mm 0   12h sun 0   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month: