Monthly Climate Summary for September 2004 at Luton (Cranleigh Gdns)
                          home daily
    Sunny and very warm till the 9th; changeable and rather windy thereafter; cloudy 25th-30th back forward
                         
Overall mean temperature was 15.5 ēC which is +1.4 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 19.9 ēC which is +1.5 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 11.0 ēC which is +1.3 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 20.0 ēC                
Mean 24hr minimum (09-09) was 10.9 ēC                
  Highest day max was 27.8 ēC on  the   5            
  Lowest day max was 14.0 ēC on  the 24            
  Highest night min was 15.3 ēC on  the 18            
  Lowest night min was 3.2 ēC on  the 16            
  Lowest grass min was 0.3 ēC on  the 25            
                         
Total rainfall this month was 30.9 mm which is 48.2 per  cent of the 1971-2000 average    
  Highest daily fall was 8.5 mm on  the 22            
Number of hours with rain was                    
Equiv. TSR rainfall duration was 19.7 hrs which is 53.0 per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration 4.6 hrs on  the 29            
  Mean rainfall intensity 1.57 mm/hr                
                         
Total CS sunshine this month was 175.6 hrs which is 128.6 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 10.6 hrs on  the 1            
                         
Maximum  snow depth  was 0.0 cm on  the               
                         
Mean sea-level pressure at 09Z 1018.0 mbar which is +1.6 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1034.6 mbar on  the 8            
  Lowest  pressure at 09Z 997.3 mbar on  the 14            
                         
Number of days with:                      
Air Frost 0   0.2mm rain 14   No  sun 0   Snow lying 0    
Grnd Frost 0   1.0mm 6   3h  sun 21   Snow/sleet 0    
Max < 0ēC 0   5mm 2   6h  sun 17   Hail 0    
Max > 10 30   10mm 0   9h  sun 8   Thunder 1    
Max > 20 12   25mm 0   12h sun 0   Fog at 09Z 0    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month:                  
First ten days warmest since 1999, driest since 1991, and sunniest since 1933            
Gusts to 44 mph on 14th and 20th                    
Total of 7.8h sunshine during last six days