Monthly Climate Summary for December 2003 at Hampstead  
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                Another sunny month, with temperature and rainfall near average     Back  Forward
Overall mean temperature was 5.2 ēC which is +0.1 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 7.4 ēC
Mean night minimum (21-09) was 3.4 ēC
Mean 24hr maximum (09-09) was 7.7 ēC which is +0.2 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 2.7 ēC which is +0.0 degC compared with the 1971-2000 average
Highest day max was 12.5 ēC on  the   13
Lowest day max was 2.0 ēC on  the 22
Highest night min was 11.6 ēC on  the 13
Lowest night min was -2.1 ēC on  the 16
Lowest grass min was -10.0 ēC on  the 16
Total rainfall this month was 66.0 mm which is 100.0 per  cent of the 1971-2000 average
Highest daily fall was 11.2 mm on  the 12
Number of hours with rain was 110.0 hrs
Equiv. TSR rainfall duration was 77.0 hrs which is 151.0 per  cent of the 1971-2000 average
Highest no of wet hrs 15.0 hrs on  the 12
Highest equiv duration 12.0 hrs on  the 12
Total sunshine this month was 66.3 hrs which is 147.3 per  cent of the 1971-2000 average
Equiv. C/S sunshine total was 72.9 hrs which is 147.3 per  cent of the 1971-2000 average
Highest daily sun was 6.8 hrs on  the 9
Maximum  snow depth  was 0.0 cm
Mean sea-level pressure at 09Z 1018.0 mbar which is +3.0 mbar compared with the 1961-1990 average
Highest pressure at 09Z 1031.8 mbar on  the 7
Lowest  pressure at 09Z 996.1 mbar on  the 28
Number of days with:
Air Frost 6 0.2mm rain 21 No  sun 9 Snow lying 0
Grnd Frost 16 1.0mm 16 3h  sun 13 Snow/sleet 3
Max < 0ēC 0 5mm 4 6h  sun 3 Hail 0
Max > 10 5 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:                
There have been only three sunnier Decembers (1962, 1999 and 2001) since records began in 1909.