Monthly Climate Summary for June 2004 at Hampstead    
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                Dry and warm first half; wet and much cooler during the second half.   back forward
                       
Overall mean temperature was 16.5 ēC which is +1.8 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 21.2 ēC              
Mean night minimum (21-09) was 11.7 ēC              
Mean 24hr maximum (09-09) was 21.2 ēC which is +2.3 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 11.7 ēC which is +1.3 degC compared with the 1971-2000 average
  Highest day max was 30.2 ēC on  the   8          
  Lowest day max was 15.3 ēC on  the 1          
  Highest night min was 16.1 ēC on  the 8          
  Lowest night min was 6.0 ēC on  the 19          
  Lowest grass min was 6.2 ēC on  the 26          
                       
Total rainfall this month was 41.1 mm which is 69.7 per  cent of the 1971-2000 average  
  Highest daily fall was 18.9 mm on  the 22          
Number of hours with rain was 43.0 hrs              
Equiv. TSR rainfall duration was 30.1 hrs which is 97.1 per  cent of the 1971-2000 average  
  Highest no of wet hrs 12.0 hrs on  the 22          
  Highest equiv duration 10.0 hrs on  the 22          
                       
Total sunshine this month was 178.2 hrs which is 98.5 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 196.1 hrs which is 98.5 per  cent of the 1971-2000 average  
  Highest daily sun was 12.1 hrs on  the 7          
                       
Maximum  snow depth  was 0.0 cm              
                       
Mean sea-level pressure at 09Z 1018.8 mbar which is +1.9 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1033.6 mbar on  the 13          
  Lowest  pressure at 09Z 992.5 mbar on  the 23          
                       
Number of days with:                    
Air Frost 0   0.2mm rain 12   No  sun 0   Snow lying 0  
Grnd Frost 0   1.0mm 7   3h  sun 25   Snow/sleet 0  
Max < 0ēC 0   5mm 3   6h  sun 14   Hail 0  
Max > 10 30   10mm 1   9h  sun 7   Thunder 2  
Max > 20 17   25mm 0   12h sun 1   Fog at 09Z 0  
Max > 30 1         15h sun 0   Gale 0  
                       
Notable events during the month:                  
Maximum of 30.2ēC on the 8th was the earliest max >30 since 1996            
First half warmest since 1970, and second half coolest since 1997