Monthly Climate Summary for January 2009 at Hampstead  
                        home daily
  Very cold but mostly dry at first; very unsettled and somewhat milder from the 11th   back forward
                       
Overall mean temperature was 3.0 ēC which is -1.2 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 5.4 ēC              
Mean night minimum (21-09) was 1.0 ēC              
Mean 24hr maximum (09-09) was 5.7 ēC which is -0.9 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 0.3 ēC which is -1.4 degC compared with the 1971-2000 average
  Highest day max was 9.3 ēC on  the   17          
  Lowest day max was -2.0 ēC on  the 10          
  Highest night min was 6.9 ēC on  the 12          
  Lowest night min was -6.0 ēC on  the 7          
  Lowest grass min was -10.8 ēC on  the 7          
                       
Total rainfall this month was 50.4 mm which is 80.0 per  cent of the 1971-2000 average  
  Highest daily fall was 8.6 mm on  the 18          
Number of hours with rain was 74.0 hrs              
Equiv. TSR rainfall duration was 51.8 hrs which is 83.5 per  cent of the 1971-2000 average  
  Highest no of wet hrs 10.0 hrs on  the 22          
  Highest equiv duration 8.3 hrs on  the 22          
Mean rainfall intensity 0.97 mm/h              
                       
Total sunshine this month was 76.5 hrs which is 180.8 per  cent of the 1971-2000 average  
Equiv. C/S sunshine total was 84.1 hrs which is 180.8 per  cent of the 1971-2000 average  
  Highest daily sun was 6.5 hrs on  the 6          
                       
Maximum  snow depth  was 1.0 cm on the 5          
                       
Mean sea-level pressure at 09Z 1011.2 mbar which is -3.7 mbar compared with the 1961-1990 average
  Highest pressure at 09Z 1030.5 mbar on  the 1          
  Lowest  pressure at 09Z 971.1 mbar on  the 23          
                       
Number of days with:                    
Air Frost 11   0.2mm rain 18   No  sun 5   Snow lying 3  
Grnd Frost 19   1.0mm 11   3h  sun 12   Snow/sleet 2  
Max < 0ēC 2   5mm 4   6h  sun 2   Hail 0  
Max > 10 0   10mm 0   9h  sun 0   Thunder 0  
Max > 20 0   25mm 0   12h sun 0   Fog at 09Z 0  
Max > 30 0         15h sun 0   Gale 0  
                       
Notable events during the month: