Monthly Climate Summary for September 2007  at Luton (Cranleigh Gardens)

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Dry, rather warm and quite sunny until the 22nd;  cool and changeable thereafter

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Overall mean temperature was

14.3

ºC

which is

+0.2

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

18.7

ºC

which is

+0.3

degC

compared with the 1971-2000 average

Mean night minimum (21-09) was

9.8

ºC

which is

+0.1

degC

compared with the 1971-2000 average

Mean 24hr maximum (09-09) was

18.7

ºC

Mean 24hr minimum (09-09) was

9.8

ºC

Highest day max was

23.3

ºC

on  the

5

Lowest day max was

11.8

ºC

on  the

26

Highest night min was

14.4

ºC

on  the

7

Lowest night min was

2.8

ºC

on  the

30

Lowest grass min was

0.1

ºC

on  the

30

Total rainfall this month was

30.4

mm

which is

47.4

per  cent

of the 1971-2000 average

Highest daily fall was

12.1

mm

on  the

23

Number of hours with rain was

TSR rainfall duration was

19.8

hrs

which is

48.6

per  cent

of the 1971-2000 average

Highest no of wet hrs

hrs

on  the

Highest duration

5.3

hrs

on  the

23

Mean rainfall intensity

1.54

mm/hr

Total CS sunshine this month was

146.9

hrs

which is

107.6

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

10.8

hrs

on  the

18

Maximum  snow depth  was

0.0

cm

on  the

Mean sea-level pressure at 09Z

1021.8

mbar

which is

5.4

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1032.9

mbar

on  the

7

Lowest  pressure at 09Z

1005.8

mbar

on  the

24

Number of days with:

Air Frost

0

0.2mm rain

12

No  sun

2

Snow lying

0

Grnd Frost

0

1.0mm

5

3h  sun

20

Snow/sleet

0

Max < 0ºC

0

5mm

2

6h  sun

11

Hail

0

Max > 10

30

10mm

1

9h  sun

6

Thunder

0

Max > 20

14

25mm

0

12h sun

0

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: