Monthly Climate Summary for  April  2009  at Luton (Cranleigh Gardens)
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                                 Mostly warm and dry;  a dull Easter otherwise long sunny periods         back forward
                         
Overall mean temperature was 10.5 ēC which is +2.2 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 15.6 ēC which is +3.0 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 5.4 ēC which is +1.5 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 15.6 ēC                
Mean 24hr minimum (09-09) was 5.4 ēC                
  Highest day max was 20.5 ēC on  the   15                 
  Lowest day max was 10.6 ēC on  the 11            
  Highest night min was 9.9 ēC on  the 16            
  Lowest night min was 0.5 ēC on  the 5            
  Lowest grass min was -4.3 ēC on  the 5            
                         
Total rainfall this month was 41.7 mm which is 72.1 per  cent of the 1971-2000 average    
  Highest daily fall was 10.8 mm on  the 16            
Number of hours with rain was                    
Equiv. TSR rainfall duration was 41.3 hrs which is 89.4 per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration 10.5 hrs on  the 26            
  Mean rainfall intensity 1.01 mm/hr                
                         
Total CS sunshine this month was 185.4 hrs which is 133.5 per  cent of the 1971-2000 average    
Equiv. C/S sunshine total was   hrs which is   per  cent of the 1971-2000 average    
  Highest daily sun was 12.9 hrs on  the 26            
                         
Maximum  snow depth  was 0.0 cm on  the               
                         
Mean sea-level pressure at 09Z 1013.3 mbar which is -1.9 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1028.1 mbar on  the 20            
  Lowest  pressure at 09Z 994.6 mbar on  the 27            
                         
Number of days with:                      
Air Frost 0   0.2mm rain 14   No  sun 4   Snow lying 0    
Grnd Frost 10   1.0mm 10   3h  sun 23   Snow/sleet 0    
Max < 0ēC 0   5mm 2   6h  sun 16   Hail 0    
Max > 10 30   10mm 1   9h  sun 9   Thunder 1    
Max > 20 2   25mm 0   12h sun 1   Fog at 09Z 3    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month: