Monthly Climate Summary for  April  2007  at Hampstead

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The warmest April on record, and one of the driest and sunniest too

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Overall mean temperature was

12.5

ºC

which is

+4.1

degC

compared with the 1971-2000 average

Mean day maximum (09-21) was

17.8

ºC

Mean night minimum (21-09) was

7.1

ºC

Mean 24hr maximum (09-09) was

17.8

ºC

which is

+5.4

degC

compared with the 1971-2000 average

Mean 24hr minimum (09-09) was

7.1

ºC

which is

+2.7

degC

compared with the 1971-2000 average

Highest day max was

21.2

ºC

on  the

15

Lowest day max was

7.0

ºC

on  the

3

Highest night min was

12.3

ºC

on  the

25

Lowest night min was

-2.5

ºC

on  the

4

Lowest grass min was

-13.2

ºC

on  the

5

Total rainfall this month was

4.0

mm

which is

7.1

per  cent

of the 1971-2000 average

Highest daily fall was

2.2

mm

on  the

25

Number of hours with rain was

9.0

hrs

Equiv. TSR rainfall duration was

6.3

hrs

which is

15.0

per  cent

of the 1971-2000 average

Highest no of wet hrs

11.0

hrs

on  the

25

Highest equiv duration

9.1

hrs

on  the

25

Total sunshine this month was

220.2

hrs

which is

172.3

per  cent

of the 1971-2000 average

Equiv. C/S sunshine total was

242.3

hrs

which is

172.3

per  cent

of the 1971-2000 average

Highest daily sun was

10.9

hrs

on  the

21

Maximum  snow depth  was

0.0

cm

Mean sea-level pressure at 09Z

1024.0

mbar

which is

8.8

mbar

compared with the 1961-1990 average

Highest pressure at 09Z

1031.2

mbar

on  the

2

Lowest  pressure at 09Z

994.7

mbar

on  the

25

Number of days with:

Air Frost

0

0.2mm rain

4

No  sun

0

Snow lying

0

Grnd Frost

6

1.0mm

1

3h  sun

27

Snow/sleet

0

Max < 0ºC

0

5mm

0

6h  sun

19

Hail

0

Max > 10

29

10mm

0

9h  sun

12

Thunder

0

Max > 20

8

25mm

0

12h sun

0

Fog at 09Z

0

Max > 30

0

15h sun

0

Gale

0

Notable events during the month: