Monthly Climate Summary for December 2007 at Hampstead

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Mild and wet early and late;  mostly fine and cold with frequent frost 11th-24th

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Overall mean temperature was

5.5

ºC

which is

+0.5

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

7.9

ºC

Mean night minimum (21-09) was

3.4

ºC

Mean 24hr maximum (09-09) was

8.1

ºC

which is

+0.6

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

2.9

ºC

which is

+0.4

degC

compared with the 1971-2000 average

Highest day max was

13.6

ºC

on  the

6

Lowest day max was

3.0

ºC

on  the

15

Highest night min was

11.3

ºC

on  the

5

Lowest night min was

-1.6

ºC

on  the

20

Lowest grass min was

-7.5

ºC

on  the

20

Total rainfall this month was

62.5

mm

which is

94.7

per  cent

of the 1971-2000 average

Highest daily fall was

10.6

mm

on  the

5

Number of hours with rain was

74.0

hrs

Equiv. TSR rainfall duration was

51.8

hrs

which is

90.9

per  cent

of the 1971-2000 average

Highest no of wet hrs

10.0

hrs

on  the

9

Highest equiv duration

8.3

hrs

on  the

9

Total sunshine this month was

80.0

hrs

which is

177.8

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

88.0

hrs

which is

177.8

per  cent

of the 1971-2000 average

Highest daily sun was

6.3

hrs

on  the

12

Maximum  snow depth  was

0.0

cm

on the

30

Mean sea-level pressure at 09Z

1021.1

mbar

which is

+6.1

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1040.8

mbar

on  the

13

Lowest  pressure at 09Z

982.8

mbar

on  the

9

Number of days with:

Air Frost

8

0.2mm rain

20

No  sun

8

Snow lying

0

Grnd Frost

12

1.0mm

9

3h  sun

14

Snow/sleet

0

Max < 0ºC

0

5mm

6

6h  sun

2

Hail

0

Max > 10

10

10mm

1

9h  sun

0

Thunder

0

Max > 20

0

25mm

0

12h sun

0

Fog at 09Z

1

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: