Monthly Climate Summary for September 2007  at Hampstead

home

daily

Very dry, especially up to the 22nd;  variable sunshine and temperatures

back

forward

Overall mean temperature was

14.8

ºC

which is

+0.5

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

19.0

ºC

Mean night minimum (21-09) was

10.7

ºC

Mean 24hr maximum (09-09) was

19.0

ºC

which is

+0.7

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

10.7

ºC

which is

+0.3

degC

compared with the 1971-2000 average

Highest day max was

24.0

ºC

on  the

5

Lowest day max was

12.9

ºC

on  the

26

Highest night min was

15.6

ºC

on  the

7

Lowest night min was

5.4

ºC

on  the

18

Lowest grass min was

2.7

ºC

on  the

30

Total rainfall this month was

18.0

mm

which is

27.3

per  cent

of the 1971-2000 average

Highest daily fall was

7.5

mm

on  the

23

Number of hours with rain was

25.0

hrs

Equiv. TSR rainfall duration was

17.5

hrs

which is

47.3

per  cent

of the 1971-2000 average

Highest no of wet hrs

8.0

hrs

on  the

28

Highest equiv duration

6.6

hrs

on  the

28

Mean Rainfall Intensity

1.03

mm/h

Total sunshine this month was

130.6

hrs

which is

100.0

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

143.6

hrs

which is

100.0

per  cent

of the 1971-2000 average

Highest daily sun was

9.2

hrs

on  the

11

Maximum  snow depth  was

0.0

cm

Mean sea-level pressure at 09Z

1022.2

mbar

which is

+5.5

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1032.9

mbar

on  the

7

Lowest  pressure at 09Z

1006.8

mbar

on  the

24

Number of days with:

Air Frost

0

0.2mm rain

8

No  sun

0

Snow lying

0

Grnd Frost

0

1.0mm

4

3h  sun

22

Snow/sleet

0

Max < 0ºC

0

5mm

2

6h  sun

8

Hail

0

Max > 10

30

10mm

0

9h  sun

1

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: