Monthly Climate Summary for May 2004 at Luton (Cranleigh Gardens)
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Wet first week; fine and warm mid-month; changeable end         back forward
                         
Overall mean temperature was 12.7 C which is +1.1 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 17.6 C which is +1.1 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 7.8 C which is +1.1 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 17.6 C                
Mean 24hr minimum (09-09) was 7.8 C                
  Highest day max was 23.8 C on the 17            
  Lowest day max was 11.9 C on the 1            
  Highest night min was 12.5 C on the 29            
  Lowest night min was 1.4 C on the 22            
  Lowest grass min was -0.4 C on the 22            
                         
Total rainfall this month was 58.5 mm which is 110.0 per cent of the 1971-2000 average    
  Highest daily fall was 17.6 mm on the 3            
Number of hours with rain was                    
Equiv. TSR rainfall duration was 40.1 hrs which is 93.6 per cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on the              
  Highest duration 12.5 hrs on the 7            
  Mean rainfall intensity 1.46 mm/hr                
                         
Total CS sunshine this month was 176.4 hrs which is 95.5 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 13.1 hrs on the 22            
                         
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 1031.2 mbar on the 16            
  Lowest pressure at 09Z 978.8 mbar on the 5            
                         
Number of days with:                      
Air Frost 0   0.2mm rain 12   No sun 2   Snow lying 0    
Grnd Frost 2   1.0mm 8   3h sun 23   Snow/sleet 0    
Max < 0C 0   5mm 4   6h sun 13   Hail 1    
Max > 10 31   10mm 2   9h sun 7   Thunder 0    
Max > 20 11   25mm 0   12h sun 2   Fog at 09Z 1    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month:                  
4th: Barometer fell to 976mbar - exceptionally low for May                
Remarkable lack of sunshine during the first two weeks with just 39.4h (48% of norm) -- previous lowest 47.3h in 1978    
Total rainfall during the 22 days 9th-30th was just 5.2mm