Monthly Climate Summary for  April  2010  at Hampstead

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Changeable early and late, but dry and sunny with frequent warm days 8th-24th

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Overall mean temperature was

10.0

ºC

which is

+1.6

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

14.8

ºC

Mean night minimum (21-09) was

5.1

ºC

Mean 24hr maximum (09-09) was

14.9

ºC

which is

+2.5

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

5.1

ºC

which is

+0.7

degC

compared with the 1971-2000 average

Highest day max was

20.6

ºC

on  the

28

Lowest day max was

8.5

ºC

on  the

1

Highest night min was

10.5

ºC

on  the

29

Lowest night min was

0.7

ºC

on  the

1

Lowest grass min was

-4.9

ºC

on  the

17

Total rainfall this month was

24.6

mm

which is

44.0

per  cent

of the 1971-2000 average

Highest daily fall was

7.9

mm

on  the

30

Number of hours with rain was

40.0

hrs

Equiv. TSR rainfall duration was

28.0

hrs

which is

66.7

per  cent

of the 1971-2000 average

Highest no of wet hrs

8.0

hrs

on  the

2

Highest equiv duration

6.6

hrs

on  the

2

Total sunshine this month was

190.1

hrs

which is

148.7

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

209.1

hrs

which is

148.7

per  cent

of the 1971-2000 average

Highest daily sun was

10.9

hrs

on  the

18

Maximum  snow depth  was

0.0

cm

on  the

Mean sea-level pressure at 09Z

1020.6

mbar

which is

+5.4

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1035.0

mbar

on  the

10

Lowest  pressure at 09Z

1001.9

mbar

on  the

3

Number of days with:

Air Frost

0

0.2mm rain

9

No  sun

0

Snow lying

0

Grnd Frost

13

1.0mm

7

3h  sun

24

Snow/sleet

0

Max < 0ºC

0

5mm

2

6h  sun

16

Hail

0

Max > 10

29

10mm

0

9h  sun

11

Thunder

0

Max > 20

3

25mm

0

12h sun

0

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: