An interesting observation.
In theory, the fly will be radiating heat off into the clear night sky when in the open or scrub but not in the bush, where tree canopy will radiate it back. So the fly material will get colder in the site with a clear view of the sky. Theres planty of water vapour in the air to condense on both outside (dew) and inside ( condensation).
Tents are more often used in clear sites and flys usually under canopy.
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