Monthly Climate Summary for   July  2009  at Luton (Cranleigh Gardens)
                          home daily
                    A hot start, but very unsettled from the 6th with near average temperature                             back forward
                         
Overall mean temperature was 17.4 ēC which is +0.3 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 22.0 ēC which is -+0.1 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 12.7 ēC which is +0.6 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 22.0 ēC                
Mean 24hr minimum (09-09) was 12.7 ēC                
  Highest day max was 29.4 ēC on  the   1                 
  Lowest day max was 18.2 ēC on  the 17            
  Highest night min was 17.8 ēC on  the 3            
  Lowest night min was 9.3 ēC on  the 10            
  Lowest grass min was 5.7 ēC on  the 10            
                         
Total rainfall this month was 73.0 mm which is 163.7 per  cent of the 1971-2000 average    
  Highest daily fall was 18.3 mm on  the 17            
Number of hours with rain was                    
TSR rainfall duration was 43.6 hrs which is 141.6 per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration 10.3 hrs on  the 26            
  Mean rainfall intensity 1.67 mm/hr                
                         
Total CS sunshine this month was 199.8 hrs which is 105.0 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 13.1 hrs on  the 2            
                         
Maximum  snow depth  was 0.0 cm on  the               
                         
Mean sea-level pressure at 09Z 1012.2 mbar which is -5.1 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1023.2 mbar on  the 1            
  Lowest  pressure at 09Z 1002.2 mbar on  the 22            
                         
Number of days with:                      
Air Frost 0   0.2mm rain 20   No  sun 2   Snow lying 0    
Grnd Frost 0   1.0mm 12   3h  sun 23   Snow/sleet 0    
Max < 0ēC 0   5mm 7   6h  sun 19   Hail 0    
Max > 10 31   10mm 1   9h  sun 9   Thunder 2    
Max > 20 25   25mm 0   12h sun 2   Fog at 09Z 0    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month: