I flew mine 2 nights ago here in upstate NY, -1F.
You gotta keep you batteries warm or it won't even start the motors.
Also, when it's cold like that, if you have a mishap, it will break!
On the reverse end of the temperature scale, air thins out the warmer it gets. Like higher altitude areas, hot air is thinner. The props have to spin faster to maintain lift.
Both are battery killers.
Last, be super careful of condensation! That will ruin and/or expand your batteries.