In article ,
says...
A question for those of you more adept at chemistry/physics than I: How
fast does the aluminum skin of the standard single engine GA aircraft take
to cool to surrounding air temperatures? For example, how long would it
take for the skin to cool from a heated hangar at 65 degrees F to outside
air at 20 degrees F?

This is my first winter where my airplane sits at my destination airport
(Buffalo, NY) all week in a heated hangar. The problem I just inherited
is that if I desire to depart during a lake effect snowfall event, falling
snow could melt on the wings and fuselage and then turn to ice.

Put some fuel in them wings for the night. Take a while to bring all
that lot down to freezing level when you head out.

Indeed the reverse happenned to me a couple years ago, I was down in
Omarama in winter and stayed the night. Had to scrape the ice of the
wings in the morn, but they kept freezing up even though it was a lovely
sunny morning. Had to leave it for a couple of cups of coffee and let
the wing warm a bit (and all the fuel in the wing) before I was happy to
fly.

--
Duncan