Glocks really aren't affected by much... bombs perhaps?
I'd be the first to admit that and I don't even like them much.
just bring your gun inside and leave it by a heating vent. Dry is dry. Warm air blowing on it will cure any condensation issues.
Seriously. I feel your over thinking the whole cold thing. Don't worry so much. Guns are far from delicate and glocks are notorious for being durable and reliable.