Monthly Climate Summary for  May  2004  at Luton (Cranleigh Gardens)
                          home daily
         Wet first week;   fine and warm mid-month;  changeable end         back forward
                         
Overall mean temperature was 12.7 ēC which is +1.1 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 17.6 ēC which is +1.1 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 7.8 ēC which is +1.1 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 17.6 ēC                
Mean 24hr minimum (09-09) was 7.8 ēC                
  Highest day max was 23.8 ēC on  the   17            
  Lowest day max was 11.9 ēC on  the 1            
  Highest night min was 12.5 ēC on  the 29            
  Lowest night min was 1.4 ēC on  the 22            
  Lowest grass min was -0.4 ēC 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 < 0ēC 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