Monthly Climate Summary for January 2007 at Hampstead

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Exceptionally mild and unsettled till the 20th, then a brief cold snap

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Overall mean temperature was

7.0

ºC

which is

+2.9

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

9.5

ºC

Mean night minimum (21-09) was

4.8

ºC

Mean 24hr maximum (09-09) was

9.6

ºC

which is

+3.0

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

4.4

ºC

which is

+2.7

degC

compared with the 1971-2000 average

Highest day max was

13.5

ºC

on  the

18

Lowest day max was

2.8

ºC

on  the

23

Highest night min was

11.5

ºC

on  the

9

Lowest night min was

-2.4

ºC

on  the

26

Lowest grass min was

-5.4

ºC

on  the

26

Total rainfall this month was

66.7

mm

which is

105.8

per  cent

of the 1971-2000 average

Highest daily fall was

12.8

mm

on  the

6

Number of hours with rain was

85.0

hrs

Equiv. TSR rainfall duration was

59.5

hrs

which is

96.0

per  cent

of the 1971-2000 average

Highest no of wet hrs

10.0

hrs

on  the

16

Highest equiv duration

8.3

hrs

on  the

16

Mean rainfall intensity

1.12

mm/h

Total sunshine this month was

69.2

hrs

which is

163.5

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

76.1

hrs

which is

163.5

per  cent

of the 1971-2000 average

Highest daily sun was

7.4

hrs

on  the

31

Maximum  snow depth  was

2.0

cm

on the

24

Mean sea-level pressure at 09Z

1016.9

mbar

which is

+2.0

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1032.5

mbar

on  the

27

Lowest  pressure at 09Z

988.1

mbar

on  the

18

Number of days with:

Air Frost

4

0.2mm rain

21

No  sun

7

Snow lying

1

Grnd Frost

6

1.0mm

12

3h  sun

11

Snow/sleet

5

Max < 0ºC

0

5mm

4

6h  sun

2

Hail

0

Max > 10

17

10mm

3

9h  sun

0

Thunder

0

Max > 20

0

25mm

0

12h sun

0

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

1

Notable events during the month:

Warmest January since 1921