Monthly Climate Summary for  May  2009  at Whipsnade (Lodge)

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A rather changeable month with a warm sunny finish

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Overall mean temperature was

11.6

ºC

which is

+0.9

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

16.5

ºC

which is

+1.2

degC

compared with the 1971-2000 average

Mean night minimum (21-09) was

6.7

ºC

which is

+0.5

degC

compared with the 1971-2000 average

Mean 24hr maximum (09-09) was

16.7

ºC

Mean 24hr minimum (09-09) was

6.6

ºC

Highest day max was

22.8

ºC

on  the

29

Lowest day max was

10.7

ºC

on  the

4

Highest night min was

11.8

ºC

on  the

28

Lowest night min was

-0.4

ºC

on  the

4

Lowest grass min was

-4.3

ºC

on  the

4

Total rainfall this month was

30.3

mm

which is

55.1

per  cent

of the 1971-2000 average

Highest daily fall was

11.0

mm

on  the

14

Number of hours with rain was

Equiv. TSR rainfall duration was

23.2

hrs

which is

per  cent

of the 1971-2000 average

Highest no of wet hrs

hrs

on  the

Highest duration

5.8

hrs

on  the

25

Mean rainfall intensity

1.31

mm/hr

Total CS sunshine this month was

235.4

hrs

which is

127.4

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

hrs

which is

per  cent

of the 1971-2000 average

Highest daily sun was

14.8

hrs

on  the

24

Maximum  snow depth  was

0.0

cm

on  the

22

Mean sea-level pressure at 09Z

1018.4

mbar

which is

+3.3

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1032.9

mbar

on  the

29

Lowest  pressure at 09Z

1000.5

mbar

on  the

15

Number of days with:

Air Frost

1

0.2mm rain

11

No  sun

0

Snow lying

0

Grnd Frost

3

1.0mm

9

3h  sun

25

Snow/sleet

0

Max < 0ºC

0

5mm

2

6h  sun

20

Hail

0

Max > 10

31

10mm

1

9h  sun

11

Thunder

0

Max > 20

7

25mm

0

12h sun

7

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: