Monthly Climate Summary for  January 2011  at Luton (Cranleigh Gardens)
                          home daily
                               Dull and rather wet;  mild spell 11th-16th otherwise mostly rather cold       back forward
                         
Overall mean temperature was 4.0 ēC which is -0.1 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 5.9 ēC which is -0.5 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 2.1 ēC which is +0.4 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 6.0 ēC                
Mean 24hr minimum (09-09) was 1.6 ēC                
  Highest day max was 12.0 ēC on  the   13                 
  Lowest day max was 0.4 ēC on  the 28            
  Highest night min was 11.0 ēC on  the 14            
  Lowest night min was -3.2 ēC on  the 29            
  Lowest grass min was -8.8 ēC on  the 31            
                         
Total rainfall this month was 84.2 mm which is 123.6 per  cent of the 1971-2000 average    
  Highest daily fall was 18.2 mm on  the 17            
Number of hours with rain was                    
Equiv. TSR rainfall duration was 97.0 hrs which is 142.2 per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration 12.0 hrs on  the 31            
  Mean rainfall intensity 0.87 mm/hr                
                         
Total CS sunshine this month was 33.4 hrs which is 63.5 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 6.7 hrs on  the 31            
                         
Maximum  snow depth  was 0.0 cm on  the               
                         
Mean sea-level pressure at 09Z 1019.3 mbar which is +4.7 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1041.0 mbar on  the 21            
  Lowest  pressure at 09Z 992.3 mbar on  the 8            
                         
Number of days with:                      
Air Frost 13   0.2mm rain 22   No  sun 17   Snow lying 0    
Grnd Frost 18   1.0mm 14   3h  sun 5   Snow/sleet 1    
Max < 0ēC 0   5mm 7   6h  sun 2   Hail 0    
Max > 10 5   10mm 2   9h  sun 0   Thunder 0    
Max > 20 0   25mm 0   12h sun 0   Fog at 09Z 3    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month: