wrote in message
...


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.

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So what is the 'true air temperature', how can it be measured?
I thought that an official screen had to be placed in open ground
in direct sunlight.
--
Col

Bolton, Lancashire
160m asl