Monthly Climate Summary for May 2005 at Hampstead  
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Driest since 1991; often cool, but with warm spells early and late   back forward
                       
Overall mean temperature was 12.3 C which is +0.4 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 16.7 C              
Mean night minimum (21-09) was 8.0 C              
Mean 24hr maximum (09-09) was 16.8 C which is +0.5 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 7.9 C which is +0.3 degC compared with the 1971-2000 average
  Highest day max was 29.8 C on the 27          
  Lowest day max was 10.5 C on the 4          
  Highest night min was 16.1 C on the 26          
  Lowest night min was 2.1 C on the 11          
  Lowest grass min was -8.6 C on the 5          
                       
Total rainfall this month was 25.5 mm which is 43.3 per cent of the 1971-2000 average  
  Highest daily fall was 7.7 mm on the 19          
Number of hours with rain was 40.0 hrs              
Equiv. TSR rainfall duration was 28.0 hrs which is 77.8 per cent of the 1971-2000 average  
  Highest no of wet hrs 12.0 hrs on the 19          
  Highest equiv duration 10.0 hrs on the 19          
Mean rainfall intensity 0.91 mm/h              
                       
Total sunshine this month was 178.0 hrs which is 98.9 per cent of the 1971-2000 average  
Equiv. C/S sunshine total was 195.8 hrs which is 98.9 per cent of the 1971-2000 average  
  Highest daily sun was 11.1 hrs on the 27          
                       
Maximum snow depth was 0.0 cm on the            
                       
Mean sea-level pressure at 09Z 1017.6 mbar which is +2.4 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1027.2 mbar on the 11          
  Lowest pressure at 09Z 1007.7 mbar on the 22          
                       
Number of days with:                    
Air Frost 0   0.2mm rain 13   No sun 0   Snow lying 0  
Grnd Frost 5   1.0mm 6   3h sun 28   Snow/sleet 0  
Max < 0C 0   5mm 2   6h sun 16   Hail 2  
Max > 10 31   10mm 0   9h sun 3   Thunder 2  
Max > 20 5   25mm 0   12h sun 0   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month:                
Min of 13.3C on the morning of the 1st the highest so early in the year since before 1961      
Max of 29.8C on the 27th was the highest on any day in May since 1947          
Overall this was the coolest May since 1996 and the driest since 1991