Monthly Climate Summary for  July  2009  at Hampstead

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Hot start, then very unsettled from the 6th with near normal temperature

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Overall mean temperature was

17.1

ºC

which is

-0.3

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

21.2

ºC

Mean night minimum (21-09) was

12.9

ºC

Mean 24hr maximum (09-09) was

21.2

ºC

which is

-0.8

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

12.9

ºC

which is

+0.2

degC

compared with the 1971-2000 average

Highest day max was

27.9

ºC

on  the

2

Lowest day max was

18.1

ºC

on  the

9

Highest night min was

18.0

ºC

on  the

3

Lowest night min was

9.4

ºC

on  the

10

Lowest grass min was

5.4

ºC

on  the

9

Total rainfall this month was

77.2

mm

which is

164.3

per  cent

of the 1971-2000 average

Highest daily fall was

12.5

mm

on  the

24

Number of hours with rain was

94.0

hrs

Equiv. TSR rainfall duration was

65.8

hrs

which is

235.0

per  cent

of the 1971-2000 average

Highest no of wet hrs

12.0

hrs

on  the

11

Highest equiv duration

10.0

hrs

on  the

11

Mean Rainfall Intensity

1.17

mm/h

Total sunshine this month was

156.3

hrs

which is

89.1

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

172.0

hrs

which is

89.1

per  cent

of the 1971-2000 average

Highest daily sun was

11.6

hrs

on  the

2

Maximum  snow depth  was

0.0

cm

Mean sea-level pressure at 09Z

1013.7

mbar

which is

-3.7

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1024.7

mbar

on  the

1

Lowest  pressure at 09Z

1004.1

mbar

on  the

23

Number of days with:

Air Frost

0

>0.2mm rain

22

No  sun

0

Snow lying

0

Grnd Frost

0

>1.0mm

14

3h  sun

22

Snow/sleet

0

Max < 0ºC

0

>   5mm

6

6h  sun

11

Hail

0

Max > 10

31

> 10mm

2

9h  sun

1

Thunder

2

Max > 20

23

> 25mm

0

12h sun

0

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: