Monthly Climate Summary for October 2009 at Hampstead  
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             A mostly dry but dull month; often rather cold till the 21st then warm   back forward
                       
Overall mean temperature was 12.1 ēC which is +0.9 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 15.3 ēC              
Mean night minimum (21-09) was 8.9 ēC              
Mean 24hr maximum (09-09) was 15.4 ēC which is +1.2 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 8.8 ēC which is +0.7 degC compared with the 1971-2000 average
  Highest day max was 18.0 ēC on  the   27          
  Lowest day max was 11.4 ēC on  the 19          
  Highest night min was 12.7 ēC on  the 24          
  Lowest night min was 3.5 ēC on  the 18          
  Lowest grass min was -2.1 ēC on  the 18          
                       
Total rainfall this month was 37.0 mm which is 53.6 per  cent of the 1971-2000 average  
  Highest daily fall was 8.6 mm on  the 7          
Number of hours with rain was 46.0 hrs              
Equiv. TSR rainfall duration was 32.2 hrs which is 74.9 per  cent of the 1971-2000 average  
  Highest no of wet hrs 7.0 hrs on  the 5          
  Highest equiv duration 5.8 hrs on  the 5          
Mean rainfall intensity   1.15 mm/h              
                       
Total sunshine this month was 73.6 hrs which is 73.7 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 81.0 hrs which is 73.7 per  cent of the 1971-2000 average  
  Highest daily sun was 7.2 hrs on  the 8          
                       
Maximum  snow depth  was 0.0 cm on the            
                       
Mean sea-level pressure at 09Z 1017.6 mbar which is +1.9 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1034.1 mbar on  the 15          
  Lowest  pressure at 09Z 997.9 mbar on  the 21          
                       
Number of days with:                    
Air Frost 0   0.2mm rain 16   No  sun 3   Snow lying 0  
Grnd Frost 2   1.0mm 9   3h  sun 12   Snow/sleet 0  
Max < 0ēC 0   5mm 3   6h  sun 4   Hail 0  
Max > 10 31   10mm 0   9h  sun 0   Thunder 0  
Max > 20 0   25mm 0   12h sun 0   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month: