Monthly Climate Summary for  January 2009  at Luton (Cranleigh Gardens)

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Coldest since 1997;  very dry first half then frequent outbreaks of rain;  quite bright

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Overall mean temperature was

2.3

ºC

which is

-1.7

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

4.7

ºC

which is

-1.7

degC

compared with the 1971-2000 average

Mean night minimum (21-09) was

0.0

ºC

which is

-1.7

degC

compared with the 1971-2000 average

Mean 24hr maximum (09-09) was

5.2

ºC

Mean 24hr minimum (09-09) was

-0.8

ºC

Highest day max was

9.0

ºC

on  the

12

Lowest day max was

-1.3

ºC

on  the

6

Highest night min was

7.5

ºC

on  the

12

Lowest night min was

-9.6

ºC

on  the

6

Lowest grass min was

-15.7

ºC

on  the

6

Total rainfall this month was

59.2

mm

which is

86.9

per  cent

of the 1971-2000 average

Highest daily fall was

11.7

mm

on  the

21

Number of hours with rain was

Equiv. TSR rainfall duration was

53.8

hrs

which is

78.9

per  cent

of the 1971-2000 average

Highest no of wet hrs

hrs

on  the

Highest duration

10.0

hrs

on  the

6

Mean rainfall intensity

1.10

mm/hr

Total CS sunshine this month was

58.6

hrs

which is

111.4

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

6.0

hrs

on  the

6

Maximum  snow depth  was

3.0

cm

on  the

4

Mean sea-level pressure at 09Z

1011.8

mbar

which is

-2.8

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1032.6

mbar

on  the

3

Lowest  pressure at 09Z

970.8

mbar

on  the

23

Number of days with:

Air Frost

15

0.2mm rain

15

No  sun

9

Snow lying

5

Grnd Frost

22

1.0mm

12

3h  sun

10

Snow/sleet

2

Max < 0ºC

4

5mm

6

6h  sun

1

Hail

0

Max > 10

0

10mm

1

9h  sun

0

Thunder

0

Max > 20

0

25mm

0

12h sun

0

Fog at 09Z

4

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: