I've flown my Mavic at -20C (-4F) without any problem. The motors seemed to turn fine and, assuming they run at the same RPM as when warner, the props will have MORE thrust in the denser air. The electronics seem in-affected by the cold, the battery only marginally affected.
I start with a warm Mavic and battery and she seems to keep herself warm enough when flying.
And now that I know the RC link will work fine from inside my truck (or house, or cabin), I'll be able to keep my fingers comfortably warm and the tablet screen in the shade!