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| Monthly Climate Summary for January 2009 at Chesham (Tennis Club) |
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home |
daily |
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| Cold and dry till
the 10th then somewhat milder and often rainy |
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back |
forward |
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| Overall mean
temperature was |
4.2 |
ēC |
which is |
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degC |
compared with the 1971-2000 average |
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| Mean day
maximum (09-21) was |
7.8 |
ēC |
which is |
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degC |
compared with the 1971-2000 average |
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| Mean night
minimum (21-09) was |
0.6 |
ēC |
which is |
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degC |
compared with the 1971-2000 average |
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| Mean 24hr
maximum (09-09) was |
7.8 |
ēC |
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| Mean 24hr
minimum (09-09) was |
-1.0 |
ēC |
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Highest day max was |
18.6 |
ēC |
on
the |
12 |
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Lowest day max was |
-0.4 |
ēC |
on the |
10 |
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Highest night min was |
15.3 |
ēC |
on the |
13 |
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Lowest night min was |
-11.9 |
ēC |
on the |
7 |
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Lowest grass min was |
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ēC |
on the |
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| Total rainfall
this month was |
79.4 |
mm |
which is |
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per cent |
of the 1971-2000 average |
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Highest daily fall was |
14.3 |
mm |
on the |
21 |
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| Number of hours
with rain was |
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| Estimated
rainfall duration* was |
26.9 |
hrs |
which is |
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per cent |
of the 1971-2000 average |
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Highest no of wet hrs |
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hrs |
on the |
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Highest duration |
5.1 |
hrs |
on the |
21 |
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Mean rainfall intensity |
2.95 |
mm/hr |
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| Total est
sunshine this month was |
22.0 |
hrs |
which is |
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per cent |
of the 1971-2000 average |
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| Equiv. C/S sunshine total was |
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hrs |
which is |
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per cent |
of the 1971-2000 average |
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Highest daily sun was |
2.8 |
hrs |
on the |
27 |
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| Maximum snow depth
was |
0.0 |
cm |
on
the |
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| Mean sea-level
pressure at 09Z |
1010.4 |
mbar |
which is |
-4.2 |
mbar |
compared with the 1961-1990 average |
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Highest pressure at 09Z |
1030.9 |
mbar |
on the |
3 |
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Lowest
pressure at 09Z |
970.5 |
mbar |
on the |
23 |
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| Total number of days with: |
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| Air Frost |
12 |
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0.2mm rain |
18 |
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No sun |
11 |
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Snow lying |
0 |
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| Grnd Frost |
0 |
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1.0mm |
13 |
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3h sun |
0 |
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Snow/sleet |
0 |
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| Max < 0ēC |
2 |
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5mm |
7 |
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6h sun |
0 |
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Hail |
0 |
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| Max > 10 |
9 |
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10mm |
2 |
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9h sun |
0 |
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Thunder |
0 |
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| Max > 20 |
0 |
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25mm |
0 |
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12h sun |
0 |
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Fog at 09Z |
0 |
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| Max > 30 |
0 |
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15h sun |
0 |
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Gale |
0 |
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| Notable events
during the month: |
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| Temperature
sensor faulty from the 11th until the 30th |
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| *Rainfall
duration is the aggregate of 5-min sampling intervals with 0.2mm or more |
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| Davis AWS
rainfall multiplied by 1.1 to achieve closest match with manually read
rainfall |
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