You know it's cold when the snow squeaks when you step on it
We've been getting odd winters the last few years. We got 1 snow storm in October, then didn't get snow again until November and this time of year it's usually very nice, 20-30 degrees average (perfect temperature for enjoying winter) and in Jan/Feb it usually gets this cold and nasty. I had some mechanics gloves on, they are just thin enough to fit in the trigger of my controller
My fingers hurt for a while afterwards, but it's fun!
I've been running lipos in the cold for 3 years now, had them completely covered in snow and run them in sub zero temperatures and never had an issue with them. Mind you, I keep them indoors at 60-70 degrees then take them outside and abuse the crap out of my truck (and being geared for 65-70 MPH on 6s lipo keeps things warm) then come right back inside so they don't really have much a chance to cool down much.