Monthly Climate Summary for September 2006  at Hampstead
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          Warmest September on record by some margin with frequent southerly winds   back forward
                       
Overall mean temperature was 16.4 ēC which is +2.1 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 20.7 ēC              
Mean night minimum (21-09) was 12.2 ēC              
Mean 24hr maximum (09-09) was 20.7 ēC which is +2.4 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 12.1 ēC which is +1.7 degC compared with the 1971-2000 average
  Highest day max was 28.1 ēC on  the   4          
  Lowest day max was 14.5 ēC on  the 28          
  Highest night min was 17.2 ēC on  the 10          
  Lowest night min was 4.8 ēC on  the 17          
  Lowest grass min was 1.9 ēC on  the 24          
                       
Total rainfall this month was 66.2 mm which is 100.3 per  cent of the 1971-2000 average  
  Highest daily fall was 15.6 mm on  the 9          
Number of hours with rain was 54.0 hrs              
Equiv. TSR rainfall duration was 37.8 hrs which is 102.2 per  cent of the 1971-2000 average  
  Highest no of wet hrs 10.0 hrs on  the 15          
  Highest equiv duration 8.3 hrs on  the 15          
Mean Rainfall Intensity 1.75 mm/h              
                       
Total sunshine this month was 135.0 hrs which is 103.5 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 148.5 hrs which is 103.5 per  cent of the 1971-2000 average  
  Highest daily sun was 9.0 hrs on  the 8          
                       
Maximum  snow depth  was 0.0 cm              
                       
Mean sea-level pressure at 09Z 1019.7 mbar which is 3.0 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1030.2 mbar on  the 3          
  Lowest  pressure at 09Z 1010.4 mbar on  the 25          
                       
Number of days with:                    
Air Frost 0   0.2mm rain 15   No  sun 2   Snow lying 0  
Grnd Frost 0   1.0mm 9   3h  sun 21   Snow/sleet 0  
Max < 0ēC 0   5mm 5   6h  sun 11   Hail 0  
Max > 10 30   10mm 3   9h  sun 1   Thunder 3  
Max > 20 18   25mm 0   12h sun 0   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month:                 
Mean temperature well above the previous September record, set in 1949