| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Monthly Climate Summary for April
2009 at Chesham (Tennis Club) |
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
home |
daily |
|
|
|
| Warm and mostly dry;
very dull Easter otherwise sunny periods |
|
|
|
back |
forward |
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Overall mean
temperature was |
9.2 |
ēC |
which is |
+0.9 |
degC |
compared with the 1971-2000 average |
|
|
|
|
|
|
| Mean day
maximum (09-21) was |
14.9 |
ēC |
which is |
+2.3 |
degC |
compared with the 1971-2000 average |
|
|
|
|
|
|
| Mean night
minimum (21-09) was |
3.4 |
ēC |
which is |
-0.5 |
degC |
compared with the 1971-2000 average |
|
|
|
|
|
|
| Mean 24hr
maximum (09-09) was |
14.9 |
ēC |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Mean 24hr
minimum (09-09) was |
3.4 |
ēC |
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
Highest day max was |
20.7 |
ēC |
on
the |
15 |
|
|
|
|
|
|
|
|
|
|
|
| |
Lowest day max was |
9.1 |
ēC |
on the |
27 |
|
|
|
|
|
|
|
|
|
|
|
| |
Highest night min was |
8.8 |
ēC |
on the |
16 |
|
|
|
|
|
|
|
|
|
|
|
| |
Lowest night min was |
-1.8 |
ēC |
on the |
1 |
|
|
|
|
|
|
|
|
|
|
|
| |
Lowest grass min was |
|
ēC |
on the |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Total rainfall
this month was |
36.8 |
mm |
which is |
63.7 |
per cent |
of the 1971-2000 average |
|
|
|
|
|
|
|
| |
Highest daily fall was |
9.0 |
mm |
on the |
16 |
|
|
|
|
|
|
|
|
|
|
|
| Number of
hours with rain was |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Equiv. TSR
rainfall duration was |
13.0 |
hrs |
which is |
28.1 |
per cent |
of the 1971-2000 average |
|
|
|
|
|
|
|
| |
Highest no of wet hrs |
|
hrs |
on the |
|
|
|
|
|
|
|
|
|
|
|
|
| |
Highest duration |
3.1 |
hrs |
on the |
16 |
|
|
|
|
|
|
|
|
|
|
|
| |
Mean rainfall intensity |
2.83 |
mm/hr |
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Total est
sunshine this month was |
144.4 |
hrs |
which is |
104.0 |
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 |
8.4 |
hrs |
on the |
24 |
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Maximum snow depth
was |
|
cm |
on
the |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Mean sea-level
pressure at 09Z |
1013.3 |
mbar |
which is |
-1.9 |
mbar |
compared with the 1961-1990 average |
|
|
|
|
|
|
| |
Highest pressure at 09Z |
1027.9 |
mbar |
on the |
20 |
|
|
|
|
|
|
|
|
|
|
|
| |
Lowest
pressure at 09Z |
994.9 |
mbar |
on the |
27 |
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Total number of days with: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Air Frost |
7 |
|
0.2mm rain |
11 |
|
No sun |
4 |
|
Snow lying |
0 |
|
|
|
|
|
|
|
| Grnd Frost |
0 |
|
1.0mm |
7 |
|
3h sun |
23 |
|
Snow/sleet |
0 |
|
|
|
|
|
|
|
| Max < 0ēC |
0 |
|
5mm |
4 |
|
6h sun |
13 |
|
Hail |
0 |
|
|
|
|
|
|
|
| Max > 10 |
29 |
|
10mm |
0 |
|
9h sun |
0 |
|
Thunder |
0 |
|
|
|
|
|
|
|
| Max > 20 |
1 |
|
25mm |
0 |
|
12h sun |
0 |
|
Fog at 09Z |
0 |
|
|
|
|
|
|
|
| Max > 30 |
0 |
|
|
|
|
15h sun |
0 |
|
Gale |
0 |
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Notable events
during the month: |
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|