How fast does the skin of the airplane cool to surrounding temperatures?

Mxsmanic opined

writes:

On a clear night the skin temperature can go BELOW the air
temperature due to the radiation losses into space.

The temperature of the aircraft won't drop below the temperature of
the ambient air, as long as the aircraft is dry.

Actually, it can. I have seen frost on metal surfaces (like wings) when the air
temp is above freezing. Taxiing will sometimes melt frost.

A clear night sky is /cold./


-ash
Cthulhu in 2005!
Why wait for nature?