Monthly Climate Summary for January 1987  at Whipsnade, Beds
                          home daily
                        Very dry and very cold. Record-breaking low temperature on the 12th     back forward
                         
Overall mean temperature was -0.4 ēC which is -3.2 degC compared with the 1971-2000 average  
Mean day maximum (09-21) was 1.6 ēC which is -3.7 degC compared with the 1971-2000 average  
Mean night minimum (21-09) was -2.3 ēC which is -2.7 degC compared with the 1971-2000 average  
Mean 24hr maximum (09-09) was 1.7 ēC                
Mean 24hr minimum (09-09) was -2.6 ēC                
  Highest day max was 9.2 ēC on  the   4            
  Lowest day max was -8.7 ēC on  the 12            
  Highest night min was 4.5 ēC on  the 1            
  Lowest night min was -11.5 ēC on  the 13            
  Lowest grass min was -16.4 ēC on  the 13            
                         
Total rainfall this month was 15.3 mm which is 22.8 per  cent of the 1971-2000 average    
  Highest daily fall was 7.2 mm on  the 4            
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 53.9 hrs which is 102.5 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 8.1 hrs on  the 30            
                         
Maximum  snow depth  was 5.0 cm on  the  14            
                         
Mean sea-level pressure at 09Z 1023.4 mbar which is +8.8 mbar compared with the 1961-1990 average  
  Highest pressure at 09Z 1040.0 mbar on  the 24            
  Lowest  pressure at 09Z 1004.0 mbar on  the 1            
                         
Number of days with:                      
Air Frost 22   0.2mm rain 15   No  sun 17   Snow lying 9    
Grnd Frost 24   1.0mm 3   3h  sun 9   Snow/sleet 7    
Max < 0ēC 10   5mm 1   6h  sun 3   Hail 0    
Max > 10 0   10mm 0   9h  sun 0   Thunder 0    
Max > 20 0   25mm 0   12h sun 0   Fog at 09Z 9    
Max > 30 0         15h sun 0   Gale 0    
                         
Notable events during the month:                  
Maximum of -8.7ēC on the 12th was by far the lowest recorded at Whipsnade in either of its incarnations. The temperature remained below zero for
                         
                         
10 consecutive days (10th-19th), and powdery snow blew into massive difts (up to 2.5m high), leaving exposed fields bare.    
No sunshine for 14 consecutive days 14th-27th inclusive.