Monthly Climate Summary for May 2005 at Luton (Cranleigh Gardens)
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Generally dry and quite sunny; some notable temperature extremes   back forward
                         
Overall mean temperature was 11.9 C which is +0.3 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 17.0 C which is +0.5 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 6.8 C which is +0.1 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 17.0 C                
Mean 24hr minimum (09-09) was 6.8 C                
  Highest day max was 30.1 C on the 27            
  Lowest day max was 9.7 C on the 4            
  Highest night min was 14.6 C on the 28            
  Lowest night min was -0.8 C on the 10            
  Lowest grass min was -3.7 C on the 15            
                         
Total rainfall this month was 37.8 mm which is 71.1 per cent of the 1971-2000 average    
  Highest daily fall was 14.1 mm on the 21            
Number of hours with rain was                    
Equiv. TSR rainfall duration was 26.8 hrs which is 90.5 per cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on the              
  Highest duration 4.7 hrs on the 13            
  Mean rainfall intensity 1.41 mm/hr                
                         
Total CS sunshine this month was 203.2 hrs which is 110.0 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 11.7 hrs on the 13            
                         
Maximum snow depth was 0.0 cm on the              
                         
Mean sea-level pressure at 09Z 1016.6 mbar which is +1.5 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1027.5 mbar on the 11            
  Lowest pressure at 09Z 1005.6 mbar on the 22            
                         
Number of days with:                      
Air Frost 3   0.2mm rain 14   No sun 1   Snow lying 0    
Grnd Frost 8   1.0mm 8   3h sun 25   Snow/sleet 0    
Max < 0C 0   5mm 2   6h sun 17   Hail 2    
Max > 10 30   10mm 1   9h sun 9   Thunder 4    
Max > 20 6   25mm 0   12h sun 0   Fog at 09Z 0    
Max > 30 1         15h sun 0   Gale 0    
                         
Notable events during the month:                  
Overall this was the coolest May since 1996, the driest since 1999, and the sunniest since 2001        
Minimum of 13.4C early on the 1st was the highest so early in the year since records began in 1900        
Minimum of -0.8C on the 10th was the lowest in May since 1996              
Maximum of 30.1C on the 27th was the highest in May since 1947, and the highest so early in the season since 1922