Monthly Climate Summary for January 1991  at Whipsnade, Beds
                          home daily
                  Very wet and windy till the 10th;  then mainly anticyclonic and rather cold     back forward
                         
Overall mean temperature was 2.5 ēC which is -0.3 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 5.0 ēC which is -0.3 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was 0.0 ēC which is -0.4 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 5.3 ēC                
Mean 24hr minimum (09-09) was -0.3 ēC                
  Highest day max was 10.4 ēC on  the   2            
  Lowest day max was -0.1 ēC on  the 30            
  Highest night min was 8.3 ēC on  the 2            
  Lowest night min was -3.8 ēC on  the 13            
  Lowest grass min was -10.4 ēC on  the 13            
                         
Total rainfall this month was 93.4 mm which is 139.4 per  cent of the 1971-2000 average    
  Highest daily fall was 16.2 mm on  the 9            
Number of hours with rain was                    
Equiv. TSR rainfall duration was   hrs which is   per  cent of the 1971-2000 average    
  Highest no of wet hrs   hrs on  the              
  Highest duration   hrs on  the              
  Mean rainfall intensity   mm/hr                
                         
Total CS sunshine this month was 66.7 hrs which is 126.8 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 16            
                         
Maximum  snow depth  was 0.0 cm on  the               
                         
Mean sea-level pressure at 09Z 1020.1 mbar which is +5.5 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1042.5 mbar on  the 22            
  Lowest  pressure at 09Z 986.7 mbar on  the 2            
                         
Number of days with:                      
Air Frost 17   0.2mm rain 18   No  sun 10   Snow lying 0    
Grnd Frost 28   1.0mm 11   3h  sun 10   Snow/sleet 6    
Max < 0ēC 1   5mm 8   6h  sun 4   Hail 0    
Max > 10 1   10mm 5   9h  sun 0   Thunder 0    
Max > 20 0   25mm 0   12h sun 0   Fog at 09Z 0    
Max > 30 0         15h sun 0   Gale 2    
                         
Notable events during the month:                  
Exceptionally sunny 12th-21st (41.0h), and exceptionally dull 22nd-31st (1.6h)            
                         
                         
Very wet start with 77mm 1st-10th