Flying below freezing

[Bad Santa]

What kinds of considerations need to be in place to fly in temps below freezing?
I'm sure there's the possibility of icing if the humidity is right but what others?
I probably won't want to fly if it's actively precipitating (snow or freezing rain)

Anything else to worry about?

I'm thinking of going up to the ski slopes.

 

[GroovyGeek]

Keep batteries warm till you insert in drone right before liftoff. Hover a bit after liftoff to ensure that battery juice gets flowing and the drone behaves correctly.
I have flown an Air2S down to around 20F in Alaska with no apparent ill effects, but at relatively low altidues and not in fog/clouds