Monthly Climate Summary for January 2010 at Hampstead

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Very cold first half with snow at times;  less cold second half; sunny early and late

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Overall mean temperature was

1.2

ºC

which is

-2.9

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

3.3

ºC

Mean night minimum (21-09) was

-0.4

ºC

Mean 24hr maximum (09-09) was

3.4

ºC

which is

-3.2

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

-1.0

ºC

which is

-2.7

degC

compared with the 1971-2000 average

Highest day max was

9.4

ºC

on  the

17

Lowest day max was

-1.0

ºC

on  the

9

Highest night min was

5.8

ºC

on  the

19

Lowest night min was

-6.4

ºC

on  the

7

Lowest grass min was

-9.8

ºC

on  the

4

Total rainfall this month was

67.7

mm

which is

107.4

per  cent

of the 1971-2000 average

Highest daily fall was

12.9

mm

on  the

16

Number of hours with rain was

102.0

hrs

Equiv. TSR rainfall duration was

71.4

hrs

which is

115.2

per  cent

of the 1971-2000 average

Highest no of wet hrs

17.0

hrs

on  the

22

Highest equiv duration

14.1

hrs

on  the

22

Mean rainfall intensity

0.95

mm/h

Total sunshine this month was

67.0

hrs

which is

158.4

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

73.7

hrs

which is

158.4

per  cent

of the 1971-2000 average

Highest daily sun was

7.2

hrs

on  the

30

Maximum  snow depth  was

13.0

cm

on the

5

Mean sea-level pressure at 09Z

1015.3

mbar

which is

+0.4

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1040.0

mbar

on  the

26

Lowest  pressure at 09Z

990.8

mbar

on  the

29

Number of days with:

Air Frost

19

0.2mm rain

21

No  sun

10

Snow lying

10

Grnd Frost

23

1.0mm

12

3h  sun

10

Snow/sleet

8

Max < 0ºC

4

5mm

5

6h  sun

5

Hail

1

Max > 10

0

10mm

1

9h  sun

0

Thunder

0

Max > 20

0

25mm

0

12h sun

0

Fog at 09Z

3

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: