Monthly Climate Summary for May 2010 at Hampstead

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A cold month, apart from a warm spell 19th-25th

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Overall mean temperature was

11.6

ºC

which is

-0.4

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

16.1

ºC

Mean night minimum (21-09) was

7.0

ºC

Mean 24hr maximum (09-09) was

16.2

ºC

which is

-0.1

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

7.0

ºC

which is

-0.6

degC

compared with the 1971-2000 average

Highest day max was

28.0

ºC

on the

24

Lowest day max was

8.0

ºC

on the

2

Highest night min was

14.0

ºC

on the

24

Lowest night min was

1.2

ºC

on the

12

Lowest grass min was

-5.5

ºC

on the

12

Total rainfall this month was

85.4

mm

which is

144.7

per cent

of the 1971-2000 average

Highest daily fall was

62.5

mm

on the

1

Number of hours with rain was

35.0

hrs

Equiv. TSR rainfall duration was

24.5

hrs

which is

68.1

per cent

of the 1971-2000 average

Highest no of wet hrs

9.0

hrs

on the

29

Highest equiv duration

7.5

hrs

on the

29

Mean rainfall intensity

3.48

mm/h

Total sunshine this month was

162.8

hrs

which is

90.4

per cent

of the 1971-2000 average

Equiv. C/S sunshine total was

179.0

hrs

which is

90.4

per cent

of the 1971-2000 average

Highest daily sun was

12.3

hrs

on the

23

Maximum snow depth was

0.0

cm

on the

Mean sea-level pressure at 09Z

1018.4

mbar

which is

+3.2

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1033.4

mbar

on the

20

Lowest pressure at 09Z

1010.2

mbar

on the

1

Number of days with:

Air Frost

0

0.2mm rain

10

No sun

1

Snow lying

0

Grnd Frost

7

1.0mm

5

3h sun

24

Snow/sleet

0

Max < 0ºC

0

5mm

2

6h sun

10

Hail

0

Max > 10

28

10mm

2

9h sun

4

Thunder

0

Max > 20

5

25mm

1

12h sun

2

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

0

Notable events during the month:

Torrential downpour 1st/2nd; 65.8mm fell in the 24h beginning 14z on the 1st