| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Monthly
Climate Summary for December 2009 at Luton (Cranleigh Gardens) |
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
home |
daily |
|
|
|
| Unsettled and
mild till the 10th; very cold and
wintry 16th-25th |
|
|
|
back |
forward |
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Overall mean
temperature was |
2.8 |
ēC |
which is |
-2.1 |
degC |
compared with the 1971-2000 average |
|
|
|
|
|
|
| Mean day
maximum (09-21) was |
4.9 |
ēC |
which is |
-2.2 |
degC |
compared with the 1971-2000 average |
|
|
|
|
|
|
| Mean night
minimum (21-09) was |
0.7 |
ēC |
which is |
-2.0 |
degC |
compared with the 1971-2000 average |
|
|
|
|
|
|
| Mean 24hr
maximum (09-09) was |
5.4 |
ēC |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Mean 24hr
minimum (09-09) was |
0.0 |
ēC |
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
Highest day max was |
10.5 |
ēC |
on
the |
7 |
|
|
|
|
|
|
|
|
|
|
|
| |
Lowest day max was |
-1.0 |
ēC |
on the |
19 |
|
|
|
|
|
|
|
|
|
|
|
| |
Highest night min was |
8.5 |
ēC |
on the |
6 |
|
|
|
|
|
|
|
|
|
|
|
| |
Lowest night min was |
-6.8 |
ēC |
on the |
19 |
|
|
|
|
|
|
|
|
|
|
|
| |
Lowest grass min was |
-12.7 |
ēC |
on the |
20 |
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Total rainfall
this month was |
113.9 |
mm |
which is |
168.2 |
per cent |
of the 1971-2000 average |
|
|
|
|
|
|
|
| |
Highest daily fall was |
19.8 |
mm |
on the |
29 |
|
|
|
|
|
|
|
|
|
|
|
| Number of
hours with rain was |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Equiv. TSR
rainfall duration was |
109.8 |
hrs |
which is |
176.5 |
per cent |
of the 1971-2000 average |
|
|
|
|
|
|
|
| |
Highest no of wet hrs |
|
hrs |
on the |
|
|
|
|
|
|
|
|
|
|
|
|
| |
Highest duration |
15.0 |
hrs |
on the |
29 |
|
|
|
|
|
|
|
|
|
|
|
| |
Mean rainfall intensity |
1.04 |
mm/hr |
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Total CS
sunshine this month was |
55.8 |
hrs |
which is |
115.1 |
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 |
6.2 |
hrs |
on the |
20 |
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Maximum snow depth
was |
19.0 |
cm |
on
the |
22 |
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Mean sea-level
pressure at 09Z |
1006.8 |
mbar |
which is |
-7.8 |
mbar |
compared with the 1961-1990 average |
|
|
|
|
|
|
| |
Highest pressure at 09Z |
1033.6 |
mbar |
on the |
11 |
|
|
|
|
|
|
|
|
|
|
|
| |
Lowest
pressure at 09Z |
985.9 |
mbar |
on the |
22 |
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Number of days
with: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Air Frost |
12 |
|
0.2mm rain |
22 |
|
No sun |
10 |
|
Snow lying |
10 |
|
|
|
|
|
|
|
| Grnd Frost |
21 |
|
1.0mm |
15 |
|
3h sun |
7 |
|
Snow/sleet |
9 |
|
|
|
|
|
|
|
| Max < 0ēC |
1 |
|
5mm |
7 |
|
6h sun |
2 |
|
Hail |
0 |
|
|
|
|
|
|
|
| Max > 10 |
3 |
|
10mm |
5 |
|
9h sun |
0 |
|
Thunder |
0 |
|
|
|
|
|
|
|
| Max > 20 |
0 |
|
25mm |
0 |
|
12h sun |
0 |
|
Fog at 09Z |
6 |
|
|
|
|
|
|
|
| Max > 30 |
0 |
|
|
|
|
15h sun |
0 |
|
Gale |
0 |
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Notable events
during the month: |
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|