Monthly Climate Summary for September 2009  at Hampstead

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Prolonged downpour on the 15th, otherwise a quiet, dry, rather warm month

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Overall mean temperature was

15.2

ºC

which is

+0.8

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

19.2

ºC

Mean night minimum (21-09) was

11.2

ºC

Mean 24hr maximum (09-09) was

19.2

ºC

which is

+0.9

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

11.2

ºC

which is

+0.8

degC

compared with the 1971-2000 average

Highest day max was

26.6

ºC

on  the

8

Lowest day max was

15.0

ºC

on  the

15

Highest night min was

16.2

ºC

on  the

8

Lowest night min was

8.2

ºC

on  the

27

Lowest grass min was

2.2

ºC

on  the

27

Total rainfall this month was

66.0

mm

which is

100.0

per  cent

of the 1971-2000 average

Highest daily fall was

53.2

mm

on  the

15

Number of hours with rain was

29.0

hrs

Equiv. TSR rainfall duration was

20.3

hrs

which is

54.9

per  cent

of the 1971-2000 average

Highest no of wet hrs

13.0

hrs

on  the

15

Highest equiv duration

10.8

hrs

on  the

15

Mean Rainfall Intensity

3.25

mm/h

Total sunshine this month was

121.4

hrs

which is

93.0

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

133.6

hrs

which is

93.0

per  cent

of the 1971-2000 average

Highest daily sun was

8.2

hrs

on  the

25

Maximum  snow depth  was

0.0

cm

Mean sea-level pressure at 09Z

1023.4

mbar

which is

+6.7

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1037.9

mbar

on  the

11

Lowest  pressure at 09Z

999.9

mbar

on  the

3

Number of days with:

Air Frost

0

0.2mm rain

5

No  sun

1

Snow lying

0

Grnd Frost

0

1.0mm

3

3h  sun

22

Snow/sleet

0

Max < 0ºC

0

5mm

2

6h  sun

7

Hail

0

Max > 10

30

10mm

2

9h  sun

0

Thunder

0

Max > 20

8

25mm

1

12h sun

0

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: