Monthly Climate Summary for November 2010 at Hampstead  
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           Coldest since 1993 in spite of a very mild start; exceptionally cold last week   back forward
                       
Overall mean temperature was 5.6 ēC which is -1.4 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 7.8 ēC              
Mean night minimum (21-09) was 3.8 ēC              
Mean 24hr maximum (09-09) was 7.9 ēC which is -1.9 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 3.4 ēC which is -0.9 degC compared with the 1971-2000 average
  Highest day max was 17.5 ēC on  the   4          
  Lowest day max was -0.1 ēC on  the 30          
  Highest night min was 14.2 ēC on  the 4          
  Lowest night min was -5.8 ēC on  the 28          
  Lowest grass min was -8.8 ēC on  the 28          
                       
Total rainfall this month was 39.4 mm which is 61.6 per  cent of the 1971-2000 average  
  Highest daily fall was 8.1 mm on  the 5          
Number of hours with rain was 76.0 hrs              
Equiv. TSR rainfall duration was 53.2 hrs which is 91.7 per  cent of the 1971-2000 average  
  Highest no of wet hrs 11.0 hrs on  the 17          
  Highest equiv duration 9.1 hrs on  the 17          
Mean rainfall intensity   0.74 mm/h              
                       
Total sunshine this month was 57.9 hrs which is 91.9 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 63.7 hrs which is 91.9 per  cent of the 1971-2000 average  
  Highest daily sun was 6.7 hrs on  the 26          
                       
Maximum  snow depth  was 2.0 cm on the 30          
                       
Mean sea-level pressure at 09Z 1007.0 mbar which is -7.5 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1022.8 mbar on  the 16          
  Lowest  pressure at 09Z 973.6 mbar on  the 8          
                       
Number of days with:                    
Air Frost 7   0.2mm rain 16   No  sun 5   Snow lying 1  
Grnd Frost 14   1.0mm 12   3h  sun 9   Snow/sleet 3  
Max < 0ēC 1   5mm 1   6h  sun 3   Hail 0  
Max > 10 9   10mm 0   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: