Monthly Climate Summary for  April  2011  at Hampstead  
                        home daily
                          Warmest on record; also very sunny and exceptionally dry   back forward
                       
Overall mean temperature was 13.3 ēC which is +4.9 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 18.5 ēC              
Mean night minimum (21-09) was 8.1 ēC              
Mean 24hr maximum (09-09) was 18.6 ēC which is +6.2 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 8.0 ēC which is +3.6 degC compared with the 1971-2000 average
  Highest day max was 26.6 ēC on  the   23          
  Lowest day max was 11.5 ēC on  the 5          
  Highest night min was 13.5 ēC on  the 23          
  Lowest night min was 3.9 ēC on  the 13          
  Lowest grass min was -3.1 ēC on  the 13          
                       
Total rainfall this month was 2.6 mm which is 4.7 per  cent of the 1971-2000 average  
  Highest daily fall was 1.8 mm on  the 4          
Number of hours with rain was 9.0 hrs              
Equiv. TSR rainfall duration was 6.3 hrs which is 15.0 per  cent of the 1971-2000 average  
  Highest no of wet hrs 5.0 hrs on  the 4          
  Highest equiv duration 4.2 hrs on  the 4          
                       
Total sunshine this month was 206.9 hrs which is 161.9 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 227.6 hrs which is 161.9 per  cent of the 1971-2000 average  
  Highest daily sun was 10.5 hrs on  the 27          
                       
Maximum  snow depth  was 0.0 cm on  the            
                       
Mean sea-level pressure at 09Z 1021.2 mbar which is +6.0 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1031.1 mbar on  the 12          
  Lowest  pressure at 09Z 1009.5 mbar on  the 2          
                       
Number of days with:                    
Air Frost 0   0.2mm rain 4   No  sun 1   Snow lying 0  
Grnd Frost 2   1.0mm 1   3h  sun 27   Snow/sleet 0  
Max < 0ēC 0   5mm 0   6h  sun 18   Hail 0  
Max > 10 30   10mm 0   9h  sun 10   Thunder 1  
Max > 20 11   25mm 0   12h sun 0   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month: