skym wrote:
A few times while flying home to KBIL on a cold night I've been told
that approach isn't getting my xpdr. Is this likely somehow related to
the cold temp?

No, just your crappy transponder.


Also, what is atc's attitude toward me hitting IDENT, and asking if
that shows anything? (I know I'm leaving myself open here.)

Hitting ident won't change anything if the transponder isn't currently
working.