Today was certainly the coldest day I have ever experienced. My phone showed minus 29 when I was leaving the hotel at about 5am. And it did not get any warmer later. All my outdoor and photography equipment went through the ultimate test. And I’m happy to report that except for iPhone X losing the image transition signal when flying the drone, everything else including Phase One (that I was afraid it might have been built mainly for a studio shooting) worked flawlessly and reliably - it definitely exceeded my own operational longevity at such weather.