Must be the fog/mist freezing. Be careful with that so you don't lose the drone! I've flown in -20 degrees F (-28C) for 20-30 minutes without issue using both Mavic 2 and Mavic 3. Have to watch the battery life, but no other issues for me, but wasn't wet or foggy. It's the ice freezing on the props, not the cold. Unless you're way below those temps.