Monthly Climate Summary for September 2003 at Hampstead  
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Dry and warm; sunniest since 1964         Back Forward
Overall mean temperature was 15.9 C which is +1.6 degC compared with the 1971-2000 average
Mean day maximum (09-21) was 21.4 C
Mean night minimum (21-09) was 10.4 C
Mean 24hr maximum (09-09) was 21.4 C which is +3.1 degC compared with the 1971-2000 average
Mean 24hr minimum (09-09) was 10.4 C which is +0.0 degC compared with the 1971-2000 average
Highest day max was 27.3 C on the 17
Lowest day max was 15.0 C on the 23
Highest night min was 15.0 C on the 22
Lowest night min was 4.0 C on the 24
Lowest grass min was -4.1 C on the 24
Total rainfall this month was 21.8 mm which is 33.0 per cent of the 1971-2000 average
Highest daily fall was 11.4 mm on the 22
Number of hours with rain was 24.0 hrs
Equiv. TSR rainfall duration was 16.8 hrs which is 64.7 per cent of the 1971-2000 average
Highest no of wet hrs 7.0 hrs on the 9
Highest equiv duration 5.6 hrs on the 9
Total sunshine this month was 183.7 hrs which is 140.8 per cent of the 1971-2000 average
Equiv. C/S sunshine total was 202.1 hrs which is 140.8 per cent of the 1971-2000 average
Highest daily sun was 10.2 hrs on the 4
Maximum snow depth was 0.0 cm
Mean sea-level pressure at 09Z 1016.8 mbar which is +5.1 mbar compared with the 1961-1990 average
Highest pressure at 09Z 1031.9 mbar on the 24
Lowest pressure at 09Z 997.9 mbar on the 22
Number of days with:
Air Frost 0 0.2mm rain 8 No sun 0 Snow lying 0
Grnd Frost 5 1.0mm 4 3h sun 25 Snow/sleet 0
Max < 0C 0 5mm 1 6h sun 14 Hail 0
Max > 10 30 10mm 1 9h sun 5 Thunder 0
Max > 20 20 25mm 0 12h sun 0 Fog at 09Z 0
Max > 30 0 15h sun 0 Gale 0
Notable events during the month:                  
Mean maximum temperature was the highest since 1938              
It was the sunniest September since 1964 and the driest since 1996