Monthly Climate Summary for December 2010 at Hampstead

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Exceptionally cold until the 9th and 16th-27th;  several moderate snowfalls

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Overall mean temperature was

0.2

ºC

which is

-4.8

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

2.3

ºC

Mean night minimum (21-09) was

-1.4

ºC

Mean 24hr maximum (09-09) was

2.5

ºC

which is

-5.0

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

-2.2

ºC

which is

-4.7

degC

compared with the 1971-2000 average

Highest day max was

7.9

ºC

on  the

11

Lowest day max was

-2.0

ºC

on  the

3

Highest night min was

6.9

ºC

on  the

29

Lowest night min was

-6.1

ºC

on  the

20

Lowest grass min was

-13.0

ºC

on  the

20

Total rainfall this month was

32.4

mm

which is

49.1

per  cent

of the 1971-2000 average

Highest daily fall was

7.5

mm

on  the

18

Number of hours with rain was

88.0

hrs

Equiv. TSR rainfall duration was

61.6

hrs

which is

108.1

per  cent

of the 1971-2000 average

Highest no of wet hrs

14.0

hrs

on  the

1

Highest equiv duration

11.6

hrs

on  the

1

Total sunshine this month was

36.0

hrs

which is

80.0

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

39.6

hrs

which is

80.0

per  cent

of the 1971-2000 average

Highest daily sun was

5.8

hrs

on  the

24

Maximum  snow depth  was

12.0

cm

on the

19,21,22

Mean sea-level pressure at 09Z

1015.2

mbar

which is

+0.2

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1036.9

mbar

on  the

15

Lowest  pressure at 09Z

992.7

mbar

on  the

18

Number of days with:

Air Frost

25

0.2mm rain

17

No  sun

15

Snow lying

16

Grnd Frost

26

1.0mm

10

3h  sun

6

Snow/sleet

9

Max < 0ºC

10

5mm

2

6h  sun

0

Hail

0

Max > 10

0

10mm

0

9h  sun

0

Thunder

0

Max > 20

0

25mm

0

12h sun

0

Fog at 09Z

9

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: