Monthly Climate Summary for  April  2004  at Luton (Cranleigh Gardens)
                          home daily
   Temperature, rainfall and sunshine all significantly above average.  Very low barometer on 18th           back forward
                         
Overall mean temperature was 9.7 ēC which is +1.5 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 14.5 ēC which is +1.9 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 5.0 ēC which is +1.1 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 14.5 ēC                
Mean 24hr minimum (09-09) was 4.9 ēC                
  Highest day max was 21.9 ēC on  the   24            
  Lowest day max was 8.2 ēC on  the 29            
  Highest night min was 9.8 ēC on  the 27            
  Lowest night min was -0.1 ēC on  the 20            
  Lowest grass min was -3.3 ēC on  the 20            
                         
Total rainfall this month was 72.2 mm which is 124.9 per  cent of the 1971-2000 average    
  Highest daily fall was 10.6 mm on  the 3            
Number of hours with rain was                    
Equiv. TSR rainfall duration was 56.8 hrs which is 124.3 per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration 10.5 hrs on  the 17            
  Mean rainfall intensity 1.27 mm/hr                
                         
Total CS sunshine this month was 138.6 hrs which is 110.9 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 12.0 hrs on  the 23            
                         
Maximum  snow depth  was 0.0 cm on  the  1            
                         
Mean sea-level pressure at 09Z 1012.7 mbar which is -2.5 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1027.5 mbar on  the 24            
  Lowest  pressure at 09Z 977.5 mbar on  the 18            
                         
Number of days with:                      
Air Frost 1   0.2mm rain 18   No  sun 5   Snow lying 0    
Grnd Frost 7   1.0mm 16   3h  sun 18   Snow/sleet 0    
Max < 0ēC 0   5mm 5   6h  sun 12   Hail 3    
Max > 10 26   10mm 3   9h  sun 5   Thunder 1    
Max > 20 3   25mm 0   12h sun 1   Fog at 09Z 0    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month:                  
Small hail on 4th, 5th and 6th, completing 10 hail days in the 32 days since 6th March          
Barometer 977.5 mbar at 09gmt on 18th, falling to 975 mbar around 15gmt -- probably the lowest in April since 1st/1994    
Four consecutive sunless days 28th April to 1st May inclusive -- last time in late-spring was 25th-28th May 1984