Monthly Climate Summary for  April  2011  at Luton (Cranleigh Gardens)
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                           Very dry and sunny;   widely the warmest April in 350 years of records       back forward
                         
Overall mean temperature was 12.8 ēC which is +4.6 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 18.8 ēC which is +6.2 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 6.8 ēC which is +2.9 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 18.9 ēC                
Mean 24hr minimum (09-09) was 6.8 ēC                
  Highest day max was 27.3 ēC on  the   23                 
  Lowest day max was 12.2 ēC on  the 13            
  Highest night min was 11.7 ēC on  the 6            
  Lowest night min was 1.4 ēC on  the 13            
  Lowest grass min was -1.9 ēC on  the 13            
                         
Total rainfall this month was 8.5 mm which is 14.7 per  cent of the 1971-2000 average    
  Highest daily fall was 2.5 mm on  the 23            
Number of hours with rain was                    
Equiv. TSR rainfall duration was 5.9 hrs which is 12.8 per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration 3.0 hrs on  the 30            
  Mean rainfall intensity 1.44 mm/hr                
                         
Total CS sunshine this month was 210.0 hrs which is 151.2 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 30            
                         
Maximum  snow depth  was 0.0 cm on  the               
                         
Mean sea-level pressure at 09Z 1020.5 mbar which is +5.3 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1030.5 mbar on  the 12            
  Lowest  pressure at 09Z 1007.7 mbar on  the 2            
                         
Number of days with:                      
Air Frost 0   0.2mm rain 6   No  sun 3   Snow lying 0    
Grnd Frost 4   1.0mm 4   3h  sun 23   Snow/sleet 0    
Max < 0ēC 0   5mm 0   6h  sun 18   Hail 0    
Max > 10 30   10mm 0   9h  sun 13   Thunder 3    
Max > 20 12   25mm 0   12h sun 4   Fog at 09Z 0    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month: