You're experience with the cold weather and the drone made me wonder if there are any drones on the market specifically made for harsh conditions like extreme cold. I'm not sure if there are but I did see that Drone Enthusiast has some interesting tips for operating one's drone in cold weather: https://www.dronethusiast.com/6-accessories-flying-drones-winter-time/
RE: TimTravels - Saalbach: Above the Clouds Part 1