Monthly Climate Summary for December 2008 at Hampstead  
                        home daily
                            Mostly dry and quite sunny; very cold first and last weeks   back forward
                       
Overall mean temperature was 3.8 ēC which is -1.2 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 6.1 ēC              
Mean night minimum (21-09) was 1.8 ēC              
Mean 24hr maximum (09-09) was 6.3 ēC which is -1.2 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 1.2 ēC which is -1.3 degC compared with the 1971-2000 average
  Highest day max was 12.5 ēC on  the   20          
  Lowest day max was -0.2 ēC on  the 31          
  Highest night min was 9.6 ēC on  the 22          
  Lowest night min was -3.1 ēC on  the 30          
  Lowest grass min was -9.0 ēC on  the 30          
                       
Total rainfall this month was 23.5 mm which is 35.7 per  cent of the 1971-2000 average  
  Highest daily fall was 12.5 mm on  the 13          
Number of hours with rain was 46.0 hrs              
Equiv. TSR rainfall duration was 32.2 hrs which is 56.5 per  cent of the 1971-2000 average  
  Highest no of wet hrs 15.0 hrs on  the 13          
  Highest equiv duration 12.5 hrs on  the 13          
                       
Total sunshine this month was 75.4 hrs which is 167.6 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 83.0 hrs which is 167.6 per  cent of the 1971-2000 average  
  Highest daily sun was 6.4 hrs on  the 7          
                       
Maximum  snow depth  was 0.0 cm on the            
                       
Mean sea-level pressure at 09Z 1018.7 mbar which is +3.7 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1037.4 mbar on  the 26          
  Lowest  pressure at 09Z 980.2 mbar on  the 4          
                       
Number of days with:                    
Air Frost 14   0.2mm rain 14   No  sun 5   Snow lying 0  
Grnd Frost 21   1.0mm 4   3h  sun 14   Snow/sleet 0  
Max < 0ēC 1   5mm 1   6h  sun 4   Hail 0  
Max > 10 4   10mm 1   9h  sun 0   Thunder 0  
Max > 20 0   25mm 0   12h sun 0   Fog at 09Z 1  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month: