Well, I live in Alaska and having carried and hunted in below zero temps for years now, I will say that you still have many options. The North Slope Borough Police, the Alaska State Troopers, and Anchorage Police carry Glock pistols. Obviously, the Glock platform functions realiably in the colder environments. I can confirm the dependability as a Glock owner that has carried them in and out of town in cold, humid, dry, and wetenvironments.
As for your carry options, it is difficult in the winter to OC when you are bundled up. One option would be to use a drop-leg holster or an Alaska Sportsman's Holster.
If you choose to conceal but are concerned about accessibility for your firearm, one option you may consider would be a Safepacker system from Wilderness Tactical.