Monthly Climate Summary for January 2010 at Hampstead  
                        home daily
  Very cold first half with snow at times;  less cold second half; sunny early and late   back forward
                       
Overall mean temperature was 1.2 ēC which is -2.9 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 3.3 ēC              
Mean night minimum (21-09) was -0.4 ēC              
Mean 24hr maximum (09-09) was 3.4 ēC which is -3.2 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was -1.0 ēC which is -2.7 degC compared with the 1971-2000 average
  Highest day max was 9.4 ēC on  the   17          
  Lowest day max was -1.0 ēC on  the 9          
  Highest night min was 5.8 ēC on  the 19          
  Lowest night min was -6.4 ēC on  the 7          
  Lowest grass min was -9.8 ēC on  the 4          
                       
Total rainfall this month was 67.7 mm which is 107.4 per  cent of the 1971-2000 average  
  Highest daily fall was 12.9 mm on  the 16          
Number of hours with rain was 102.0 hrs              
Equiv. TSR rainfall duration was 71.4 hrs which is 115.2 per  cent of the 1971-2000 average  
  Highest no of wet hrs 17.0 hrs on  the 22          
  Highest equiv duration 14.1 hrs on  the 22          
Mean rainfall intensity 0.95 mm/h              
                       
Total sunshine this month was 67.0 hrs which is 158.4 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 73.7 hrs which is 158.4 per  cent of the 1971-2000 average  
  Highest daily sun was 7.2 hrs on  the 30          
                       
Maximum  snow depth  was 13.0 cm on the 5          
                       
Mean sea-level pressure at 09Z 1015.3 mbar which is +0.4 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1040.0 mbar on  the 26          
  Lowest  pressure at 09Z 990.8 mbar on  the 29          
                       
Number of days with:                    
Air Frost 19   0.2mm rain 21   No  sun 10   Snow lying 10  
Grnd Frost 23   1.0mm 12   3h  sun 10   Snow/sleet 8  
Max < 0ēC 4   5mm 5   6h  sun 5   Hail 1  
Max > 10 0   10mm 1   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: