I read a recent military test results on gun oils used in Alaska's Artic cold, the Rem-Oil was an outstanding preformer according to the test results (I think the temps reached -30 degrees, if my memory is correct.) It wouldn't gum-up the action is it was really cold. Others oils were mentioned, but that was the one that sticks out in my mind, and the one I've used lately.

Tetra-Gun is another lube I use. Tetra-Gun's development was a direct result of NASA space program, or so I was informed by a gentleman who likes to look into those type of things.