Monthly Climate Summary for  April  2008  at Hampstead

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Cold and showery between the 5th and 19th; notably snowfall on the 6th

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Overall mean temperature was

8.8

ºC

which is

+0.4

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

12.9

ºC

Mean night minimum (21-09) was

4.7

ºC

Mean 24hr maximum (09-09) was

13.0

ºC

which is

+0.6

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

4.7

ºC

which is

+0.3

degC

compared with the 1971-2000 average

Highest day max was

21.1

ºC

on  the

26

Lowest day max was

4.4

ºC

on  the

6

Highest night min was

13.4

ºC

on  the

27

Lowest night min was

-1.7

ºC

on  the

7

Lowest grass min was

-5.1

ºC

on  the

15

Total rainfall this month was

56.1

mm

which is

100.3

per  cent

of the 1971-2000 average

Highest daily fall was

14.7

mm

on  the

29

Number of hours with rain was

66.0

hrs

Equiv. TSR rainfall duration was

46.2

hrs

which is

110.0

per  cent

of the 1971-2000 average

Highest no of wet hrs

12.0

hrs

on  the

29

Highest equiv duration

10.0

hrs

on  the

29

Total sunshine this month was

135.6

hrs

which is

106.1

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

149.1

hrs

which is

106.1

per  cent

of the 1971-2000 average

Highest daily sun was

9.1

hrs

on  the

22

Maximum  snow depth  was

6.0

cm

on  the

6

Mean sea-level pressure at 09Z

1011.3

mbar

which is

-3.9

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1031.3

mbar

on  the

3

Lowest  pressure at 09Z

987.3

mbar

on  the

30

Number of days with:

Air Frost

5

0.2mm rain

17

No  sun

2

Snow lying

1

Grnd Frost

9

1.0mm

13

3h  sun

23

Snow/sleet

1

Max < 0ºC

0

5mm

4

6h  sun

10

Hail

3

Max > 10

24

10mm

1

9h  sun

2

Thunder

1

Max > 20

1

25mm

0

12h sun

0

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: