Monthly Climate Summary for  April  2009  at Hampstead

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Mostly dry and warm;  a dull Easter otherwise long sunny periods

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Overall mean temperature was

11.0

ºC

which is

+2.6

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

15.2

ºC

Mean night minimum (21-09) was

6.8

ºC

Mean 24hr maximum (09-09) was

15.2

ºC

which is

+2.8

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

6.7

ºC

which is

+2.3

degC

compared with the 1971-2000 average

Highest day max was

19.9

ºC

on  the

21

Lowest day max was

9.3

ºC

on  the

27

Highest night min was

11.1

ºC

on  the

16

Lowest night min was

2.5

ºC

on  the

28

Lowest grass min was

-1.2

ºC

on  the

28

Total rainfall this month was

23.8

mm

which is

42.4

per  cent

of the 1971-2000 average

Highest daily fall was

5.7

mm

on  the

16

Number of hours with rain was

47.0

hrs

Equiv. TSR rainfall duration was

32.9

hrs

which is

78.3

per  cent

of the 1971-2000 average

Highest no of wet hrs

11.0

hrs

on  the

10

Highest equiv duration

9.1

hrs

on  the

10

Total sunshine this month was

159.3

hrs

which is

124.7

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

175.3

hrs

which is

124.7

per  cent

of the 1971-2000 average

Highest daily sun was

10.4

hrs

on  the

22

Maximum  snow depth  was

0.0

cm

on  the

Mean sea-level pressure at 09Z

1014.5

mbar

which is

-0.7

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1028.7

mbar

on  the

20

Lowest  pressure at 09Z

996.9

mbar

on  the

27

Number of days with:

Air Frost

0

0.2mm rain

13

No  sun

3

Snow lying

0

Grnd Frost

3

1.0mm

6

3h  sun

22

Snow/sleet

0

Max < 0ºC

0

5mm

1

6h  sun

14

Hail

0

Max > 10

29

10mm

0

9h  sun

7

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: