Monthly Climate Summary for  May  2008  at Hampstead

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Exceptionally warm and sunny first fortnight; very wet 24th-29th

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Overall mean temperature was

14.2

ºC

which is

+2.3

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

18.8

ºC

Mean night minimum (21-09) was

9.6

ºC

Mean 24hr maximum (09-09) was

18.9

ºC

which is

+2.6

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

9.6

ºC

which is

+2.0

degC

compared with the 1971-2000 average

Highest day max was

25.5

ºC

on  the

11

Lowest day max was

11.2

ºC

on  the

26

Highest night min was

14.3

ºC

on  the

10

Lowest night min was

3.4

ºC

on  the

20

Lowest grass min was

-0.4

ºC

on  the

20

Total rainfall this month was

87.3

mm

which is

148.0

per  cent

of the 1971-2000 average

Highest daily fall was

23.5

mm

on  the

26

Number of hours with rain was

56.0

hrs

Equiv. TSR rainfall duration was

39.2

hrs

which is

108.9

per  cent

of the 1971-2000 average

Highest no of wet hrs

16.0

hrs

on  the

26

Highest equiv duration

13.3

hrs

on  the

26

Mean rainfall intensity

2.23

mm/h

Total sunshine this month was

175.0

hrs

which is

97.2

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

192.5

hrs

which is

97.2

per  cent

of the 1971-2000 average

Highest daily sun was

11.7

hrs

on  the

6

Maximum  snow depth  was

0.0

cm

on the

Mean sea-level pressure at 09Z

1016.3

mbar

which is

+1.1

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1026.7

mbar

on  the

5

Lowest  pressure at 09Z

1003.2

mbar

on  the

28

Number of days with:

Air Frost

0

0.2mm rain

11

No  sun

4

Snow lying

0

Grnd Frost

1

1.0mm

8

3h  sun

23

Snow/sleet

0

Max < 0ºC

0

5mm

4

6h  sun

13

Hail

0

Max > 10

31

10mm

4

9h  sun

8

Thunder

1

Max > 20

16

25mm

0

12h sun

0

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: