Monthly Climate Summary for May 2004 at Hampstead  
                        home daily
           Cool and wet first week, then dry and warm until almost the end of the month   back forward
                       
Overall mean temperature was 13.0 ēC which is +1.0 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 17.4 ēC              
Mean night minimum (21-09) was 8.6 ēC              
Mean 24hr maximum (09-09) was 17.5 ēC which is +1.2 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 8.5 ēC which is +0.9 degC compared with the 1971-2000 average
  Highest day max was 23.9 ēC on  the   19          
  Lowest day max was 9.4 ēC on  the 4          
  Highest night min was 13.1 ēC on  the 20          
  Lowest night min was 3.7 ēC on  the 22          
  Lowest grass min was 1.2 ēC on  the 13          
                       
Total rainfall this month was 46.2 mm which is 78.3 per  cent of the 1971-2000 average  
  Highest daily fall was 12.8 mm on  the 3          
Number of hours with rain was 39.0 hrs              
Equiv. TSR rainfall duration was 27.3 hrs which is 91.0 per  cent of the 1971-2000 average  
  Highest no of wet hrs 9.0 hrs on  the 3          
  Highest equiv duration 7.5 hrs on  the 3          
                       
Total sunshine this month was 173.9 hrs which is 96.6 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 191.2 hrs which is 96.6 per  cent of the 1971-2000 average  
  Highest daily sun was 11.9 hrs on  the 19          
                       
Maximum  snow depth  was 0.0 cm              
                       
Mean sea-level pressure at 09Z 1017.7 mbar which is +2.5 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1031.8 mbar on  the 16          
  Lowest  pressure at 09Z 980.7 mbar on  the 5          
                       
Number of days with:                    
Air Frost 0   0.2mm rain 10   No  sun 0   Snow lying 0  
Grnd Frost 0   1.0mm 6   3h  sun 23   Snow/sleet 0  
Max < 0ēC 0   5mm 4   6h  sun 15   Hail 1  
Max > 10 30   10mm 3   9h  sun 5   Thunder 0  
Max > 20 9   25mm 0   12h sun 0   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month:                  
Driest and warmest May since 2001                  
Sea-level pressure dropped to 978.5 mbar at 0125 gmt on the 5th; this May have been the lowest in May since 1943  
The max temp on the 4th was the lowest in May for three years