Monthly Climate Summary for September 2008  at Luton (Cranleigh Gardens)

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Cool, dull and very wet first half (especially the first week); mostly dry and bright second half

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Overall mean temperature was

13.8

ºC

which is

-0.3

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

17.9

ºC

which is

-0.5

degC

compared with the 1971-2000 average

Mean night minimum (21-09) was

9.6

ºC

which is

-0.1

degC

compared with the 1971-2000 average

Mean 24hr maximum (09-09) was

17.9

ºC

Mean 24hr minimum (09-09) was

9.6

ºC

Highest day max was

20.6

ºC

on  the

20

Lowest day max was

14.4

ºC

on  the

30

Highest night min was

14.5

ºC

on  the

11

Lowest night min was

4.0

ºC

on  the

28

Lowest grass min was

0.4

ºC

on  the

28

Total rainfall this month was

74.3

mm

which is

115.9

per  cent

of the 1971-2000 average

Highest daily fall was

30.5

mm

on  the

5

Number of hours with rain was

TSR rainfall duration was

44.4

hrs

which is

109.1

per  cent

of the 1971-2000 average

Highest no of wet hrs

hrs

on  the

Highest duration

14.0

hrs

on  the

5

Mean rainfall intensity

1.67

mm/hr

Total CS sunshine this month was

109.6

hrs

which is

80.3

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

8.9

hrs

on  the

26

Maximum  snow depth  was

0.0

cm

on  the

Mean sea-level pressure at 09Z

1018.1

mbar

which is

1.7

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1038.0

mbar

on  the

26

Lowest  pressure at 09Z

993.6

mbar

on  the

6

Number of days with:

Air Frost

0

0.2mm rain

17

No  sun

2

Snow lying

0

Grnd Frost

0

1.0mm

10

3h  sun

16

Snow/sleet

0

Max < 0ºC

0

5mm

4

6h  sun

9

Hail

1

Max > 10

30

10mm

2

9h  sun

0

Thunder

2

Max > 20

4

25mm

1

12h sun

0

Fog at 09Z

2

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: