Monthly Climate Summary for September 2010  at Hampstead

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A changeable month with a rather cold, cloudy and wet last week

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Overall mean temperature was

14.3

ºC

which is

-0.1

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

17.9

ºC

Mean night minimum (21-09) was

10.7

ºC

Mean 24hr maximum (09-09) was

17.9

ºC

which is

-0.4

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

10.6

ºC

which is

+0.2

degC

compared with the 1971-2000 average

Highest day max was

22.7

ºC

on  the

22

Lowest day max was

12.6

ºC

on  the

24

Highest night min was

15.4

ºC

on  the

11

Lowest night min was

4.3

ºC

on  the

25

Lowest grass min was

1.4

ºC

on  the

18

Total rainfall this month was

52.4

mm

which is

79.3

per  cent

of the 1971-2000 average

Highest daily fall was

13.6

mm

on  the

6

Number of hours with rain was

55.0

hrs

Equiv. TSR rainfall duration was

38.5

hrs

which is

104.1

per  cent

of the 1971-2000 average

Highest no of wet hrs

11.0

hrs

on  the

6

Highest equiv duration

9.1

hrs

on  the

6

Mean Rainfall Intensity

1.36

mm/h

Total sunshine this month was

104.6

hrs

which is

80.1

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

115.0

hrs

which is

80.1

per  cent

of the 1971-2000 average

Highest daily sun was

9.8

hrs

on  the

1

Maximum  snow depth  was

0.0

cm

Mean sea-level pressure at 09Z

1016.5

mbar

which is

-0.2

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1027.3

mbar

on  the

13

Lowest  pressure at 09Z

1002.4

mbar

on  the

7

Number of days with:

Air Frost

0

0.2mm rain

12

No  sun

1

Snow lying

0

Grnd Frost

0

1.0mm

8

3h  sun

15

Snow/sleet

0

Max < 0ºC

0

5mm

4

6h  sun

6

Hail

0

Max > 10

30

10mm

2

9h  sun

2

Thunder

0

Max > 20

7

25mm

0

12h sun

0

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: