I'm sure some of the Americans above the Mason Dixon line, and definately the Canadians can help with this problem.
Does someone have a technical explanation for exactly why it is a standard 5 pin tumbler reacts more poorly to picking when the weather is cold as opposed to a warm indoor climate? They seem to get a "rusty" feeling to them, as well as not want to stay settled at the shear line. I'm sure it's made worse by the fact that your hands get cold picking as well.
Following that, what are some good solutions to this problem? I have a sneaking suspicion a little lock lube wouldn't hurt, but is there anything else?