|
Warm for
the first two weeks, then much cooler and at times,
wetter with less sunshine.
Summer
continued until the 15th, then things turned cooler
though it remained dry until the 23rd. During the second
half of the month there were a few unusually cold
nights, though no air or grass frosts were recorded.
There was also an absence of any warm nights, which are
normally quite prevalent in September, especially during
the first two weeks of the month. |
|
Rainfall was concentrated
in one big downfall that lasted for over 24 hours and
deposited 64.2 mm of rain in the gauge. This was more
than the amount that fell on July 7th this year which
resulted in serious flooding. This time there were no
floods as there had been little rainfall leading up to
the 23rd and the ground was dry. |
|
As
expected for September, there
were no air frosts or grass frosts. Unusually, no thunder was
heard. It was foggy at 9am on 3 mornings. |
|
Sunshine
amounts were reasonable though lower than the average.
The amount of sunshine as a percentage of the total
possible was higher than any of the summer months, and
the highest since May (47%). |
|
Soil temperatures only
slowly declined during the first half of the month, but
then the temperatures fell more rapidly as autumnal type
weather dominated from the middle of the month onwards. |
|
The dominant wind direction was
from the north and north west, and therefore it was not
surprising that this month ended up cooler than average.
It was also a rather windless month with just 1501 wind
run miles. This is the lowest for any month in the
station record and very surprising for a September
month. |
|
Rainfall duration was a
mere 28.5
hours even though the rainfall was well above the
average. This was due to the overwhelming majority of
the rainfall falling in just one event over the 23rd and
24th. |
|
Sea surface temperatures
increased during the first week but then started
lowering, with the temperature drop accelerating as
cooler conditions set in after mid-month. |
|
Mean pressure was
just slightly below the average for September but
overall, it was settled for the first 3 weeks. |
|
A new sensor has been
added that measures solar irradiance in watts per square
metre falling on a horizontal surface. |
|
Dewpoints were slightly
below
the average. |
|
Relative humidity was
a little above normal. |
