wrote in message
...
On Apr 5, 11:06 am, "Dave Cornwell"
wrote:
wrote in message

...
On Apr 4, 6:58 pm, "Dave Cornwell"

wrote:
At this time of year, in full sunshine and with stable conditions and a
light breeze, approximately what time of day would the expected maximum
temperature occur?
Dave

It depends quite strongly on the time of year. In Dec/Jan the
max is often not much after 1300Z because later in the afternoon the
sun is becoming very low. In high summer the maximum is quite a bit
later. In neutral conditions a typical time would be 1530Z but that
depends, at least here, on the wind direction, given similar amounts
of sunshine. With a NE'ly the max here is early (typically 1400Z even
in summer) due to cool air from the N Sea or Thames Estuary being
drawn in later in the afternoon but with a W to NW'ly the max can be
as late as 1730Z. All this assumes a fairly constant level of
sunshine.

Tudor Hughes, Warlingham, NE Surrey, 556 ft.
----------------
Thanks all. The reason I asked was that in the last few days i was getting
a
peak around 3pm - 3.30 pm then a slight drop. Then another peak about one
degree higher at around 4.30 -5.00 pm. I have concluded the former to be
real, the latter to be because the low sun hits the screen at 90 degs full
on at the later time at this time of year and there is a small gap of
about
3mm above the door which maybe makes a slight difference. I will plug it
and
see.
Cheers,
Dave

Unfortunately, Dave, the sun will raise the screen temperature
above the true air temperature whether there are gaps in it or not. I
notice this when the sun goes behind a tree in next door's garden.
You could rotate the screen so that the door faces north. Bit of a
palaver.

Tudor Hughes, Warlingham, Surrey.
I've filled the gap in now Tudor so all sides are the same. Sod's law the
sun went in from about 3.30 to 4.30pm today!
Dave