Monthly Climate Summary for January 2009 at Hampstead

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Very cold but mostly dry at first; very unsettled and somewhat milder from the 11th

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Overall mean temperature was

3.0

ºC

which is

-1.2

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

5.4

ºC

Mean night minimum (21-09) was

1.0

ºC

Mean 24hr maximum (09-09) was

5.7

ºC

which is

-0.9

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

0.3

ºC

which is

-1.4

degC

compared with the 1971-2000 average

Highest day max was

9.3

ºC

on  the

17

Lowest day max was

-2.0

ºC

on  the

10

Highest night min was

6.9

ºC

on  the

12

Lowest night min was

-6.0

ºC

on  the

7

Lowest grass min was

-10.8

ºC

on  the

7

Total rainfall this month was

50.4

mm

which is

80.0

per  cent

of the 1971-2000 average

Highest daily fall was

8.6

mm

on  the

18

Number of hours with rain was

74.0

hrs

Equiv. TSR rainfall duration was

51.8

hrs

which is

83.5

per  cent

of the 1971-2000 average

Highest no of wet hrs

10.0

hrs

on  the

22

Highest equiv duration

8.3

hrs

on  the

22

Mean rainfall intensity

0.97

mm/h

Total sunshine this month was

76.5

hrs

which is

180.8

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

84.1

hrs

which is

180.8

per  cent

of the 1971-2000 average

Highest daily sun was

6.5

hrs

on  the

6

Maximum  snow depth  was

1.0

cm

on the

5

Mean sea-level pressure at 09Z

1011.2

mbar

which is

-3.7

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1030.5

mbar

on  the

1

Lowest  pressure at 09Z

971.1

mbar

on  the

23

Number of days with:

Air Frost

11

0.2mm rain

18

No  sun

5

Snow lying

3

Grnd Frost

19

1.0mm

11

3h  sun

12

Snow/sleet

2

Max < 0ºC

2

5mm

4

6h  sun

2

Hail

0

Max > 10

0

10mm

0

9h  sun

0

Thunder

0

Max > 20

0

25mm

0

12h sun

0

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: