Monthly Climate Summary for September 2008  at Hampstead

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Dull and wet first half;  mainly dry and brighter second half

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Overall mean temperature was

14.2

ºC

which is

-0.2

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

17.5

ºC

Mean night minimum (21-09) was

10.8

ºC

Mean 24hr maximum (09-09) was

17.6

ºC

which is

-0.7

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

10.8

ºC

which is

+0.4

degC

compared with the 1971-2000 average

Highest day max was

20.3

ºC

on  the

19

Lowest day max was

13.9

ºC

on  the

30

Highest night min was

14.5

ºC

on  the

11

Lowest night min was

8.0

ºC

on  the

29

Lowest grass min was

3.5

ºC

on  the

19

Total rainfall this month was

57.2

mm

which is

86.7

per  cent

of the 1971-2000 average

Highest daily fall was

19.8

mm

on  the

5

Number of hours with rain was

82.0

hrs

Equiv. TSR rainfall duration was

57.4

hrs

which is

155.1

per  cent

of the 1971-2000 average

Highest no of wet hrs

14.0

hrs

on  the

6

Highest equiv duration

11.6

hrs

on  the

6

Mean Rainfall Intensity

1.00

mm/h

Total sunshine this month was

107.6

hrs

which is

82.5

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

118.4

hrs

which is

82.5

per  cent

of the 1971-2000 average

Highest daily sun was

8.7

hrs

on  the

14

Maximum  snow depth  was

0.0

cm

Mean sea-level pressure at 09Z

1018.5

mbar

which is

+1.8

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1037.4

mbar

on  the

26

Lowest  pressure at 09Z

995.5

mbar

on  the

6

Number of days with:

Air Frost

0

0.2mm rain

15

No  sun

3

Snow lying

0

Grnd Frost

0

1.0mm

11

3h  sun

16

Snow/sleet

0

Max < 0ºC

0

5mm

4

6h  sun

8

Hail

0

Max > 10

30

10mm

1

9h  sun

0

Thunder

0

Max > 20

2

25mm

0

12h sun

0

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: