I flew successfully in a -15 °C temperature, with over 85% humidity. It didn't last long, not because of any technical problem, but because I wanted to stay cautious and not tempt the devil. Also, because of my fingers' well-being.
My first attempt gave me an error on the control interface, but I can't remember exactly what it was. It was a red reading and a strong beeping. The error showed up while on the ground, just as I started the rotors. I presumed it was because of the cold, so I didn't take any chance and I cancelled everything and got back home. That was after driving my car about 10 minutes to reach my destination. So my best guess is that because the Mavic spent 10 minutes in the cold, it didn't like it when it was turned on. Could be a humidity build-up.
After that first attempt, I figured that I could try to start the Mavic as soon as possible after taking it outside, so that it doesn't have time to cool down. It worked, but I stayed very cautious and I didn't fly too far from the home point. My main observation is that the battery drained quite fast. The video has some wobbling in it, especially in the top-left corner. I thought it could be caused by a temperature difference between the device and the surrounding air. A bit similar to when you look over a fire. Maybe that combined with the movements of the blades. I'm not sure. The sun was also relatively low in the sky (almost winter solstice), despite the time of day being about 12h30.
Here's a few pictures and videos from that day. Also, some weather statistics (
source) :
December 17th, 2017, 12h. Taken from St-Hubert weather station, approx. coordinates : 45°31'03" N, 73°25'01" W.
Temperature : -14.6 °C
Relative humidity : 86%
Wind speed : 5 km/h (NE)
Visibility : 4 km
Pressure : 102.49 kPa
Photos :
Exposure time was 1/2000.
Videos :
Video 1
Video 2
Video 3
The videos were not edited, other than trimmed for length and scaled to 1080p. The hard part was to get a reasonable exposure time given the position of the sun, both for videos and photos.