Monthly Climate Summary for  May  2007  at Hampstead

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Dull and very wet;  variable temperatures

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Overall mean temperature was

12.9

ºC

which is

+0.9

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

16.8

ºC

Mean night minimum (21-09) was

8.8

ºC

Mean 24hr maximum (09-09) was

17.0

ºC

which is

+0.7

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

8.7

ºC

which is

+1.1

degC

compared with the 1971-2000 average

Highest day max was

24.8

ºC

on  the

24

Lowest day max was

6.8

ºC

on  the

28

Highest night min was

13.1

ºC

on  the

25

Lowest night min was

3.5

ºC

on  the

29

Lowest grass min was

0.5

ºC

on  the

29

Total rainfall this month was

95.0

mm

which is

161.1

per  cent

of the 1971-2000 average

Highest daily fall was

29.0

mm

on  the

27

Number of hours with rain was

126.0

hrs

Equiv. TSR rainfall duration was

88.2

hrs

which is

245.0

per  cent

of the 1971-2000 average

Highest no of wet hrs

21.0

hrs

on  the

27

Highest equiv duration

17.4

hrs

on  the

27

Mean rainfall intensity

1.08

mm/h

Total sunshine this month was

132.1

hrs

which is

73.4

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

145.3

hrs

which is

73.4

per  cent

of the 1971-2000 average

Highest daily sun was

12.2

hrs

on  the

23

Maximum  snow depth  was

0.0

cm

on the

Mean sea-level pressure at 09Z

1012.4

mbar

which is

-2.8

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1024.7

mbar

on  the

23

Lowest  pressure at 09Z

998.4

mbar

on  the

27

Number of days with:

Air Frost

0

0.2mm rain

19

No  sun

3

Snow lying

0

Grnd Frost

0

1.0mm

16

3h  sun

17

Snow/sleet

0

Max < 0ºC

0

5mm

6

6h  sun

10

Hail

0

Max > 10

30

10mm

2

9h  sun

4

Thunder

0

Max > 20

6

25mm

1

12h sun

1

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: