Monthly Climate Summary for  April 2004 at Hampstead    
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                  Mostly rather warm with normal sunshine. Some heavy falls of rain     Back Forward
                       
Overall mean temperature was 10.1 ēC which is +1.7 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 14.2 ēC              
Mean night minimum (21-09) was 6.1 ēC              
Mean 24hr maximum (09-09) was 14.2 ēC which is +1.8 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 6.0 ēC which is +1.6 degC compared with the 1971-2000 average
  Highest day max was 21.6 ēC on  the   24          
  Lowest day max was 7.8 ēC on  the 29          
  Highest night min was 9.9 ēC on  the 25          
  Lowest night min was 1.4 ēC on  the 11          
  Lowest grass min was -7.3 ēC on  the 20          
                       
Total rainfall this month was 77.2 mm which is 137.9 per  cent of the 1971-2000 average  
  Highest daily fall was 22.4 mm on  the 27          
Number of hours with rain was 81.0 hrs              
Equiv. TSR rainfall duration was 56.7 hrs which is 177.2 per  cent of the 1971-2000 average  
  Highest no of wet hrs 11.0 hrs on  the 18          
  Highest equiv duration 8.8 hrs on  the 18          
                       
Total sunshine this month was 135.6 hrs which is 106.1 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 149.2 hrs which is 106.1 per  cent of the 1971-2000 average  
  Highest daily sun was 10.6 hrs on  the 22          
                       
Maximum  snow depth  was 4.0 cm   1          
                       
Mean sea-level pressure at 09Z 1020.8 mbar which is -1.6 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1028.6 mbar on  the 24          
  Lowest  pressure at 09Z 979.6 mbar on  the 18          
                       
Number of days with:                    
Air Frost 0   0.2mm rain 17   No  sun 2   Snow lying 0  
Grnd Frost 12   1.0mm 13   3h  sun 18   Snow/sleet 0  
Max < 0ēC 0   5mm 5   6h  sun 11   Hail 2  
Max > 10 26   10mm 2   9h  sun 3   Thunder 1  
Max > 20 3   25mm 0   12h sun 0   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month:                
Very warm spell 22nd-27th with sudden thunderstorm late-afternoon on the 27th          
Barometer 976.7 mbar at 1245gmt on the 18th, probably the lowest April pressure since 1994/1st