Monthly Climate Summary for September 2005 at Hampstead
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Exceptionally warm first 10 days, then rather changeable and somewhat cooler   back forward
                       
Overall mean temperature was 16.4 C which is +2.1 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 20.7 C              
Mean night minimum (21-09) was 12.2 C              
Mean 24hr maximum (09-09) was 20.7 C which is +2.4 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 12.1 C which is +1.7 degC compared with the 1971-2000 average
  Highest day max was 28.1 C on the 4          
  Lowest day max was 14.5 C on the 28          
  Highest night min was 17.2 C on the 10          
  Lowest night min was 4.8 C on the 17          
  Lowest grass min was 1.9 C 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 < 0C 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:                
The mean temperature for the first 10 days was the highest for this period since 1949        
The minimum of 17.2C on the 10th was the highest in September (equal with 1982) since 1949