Originally Posted by
corrado33
That is, in no way, shape, or form a worry. I've ridden rim brakes down to -40C, so unless you're in the arctic circle, you're probably not going to see worse.
I've definitely lost brakes, while riding in freezing rain. The rims were completely coated in ice. Tires and myself as well - when I dismounted and shook myself, I had a 1/4" thick me-shaped shell crack off and fall to the ground.
It impacts discs a little but only for half a second, the ice sheds off instantly.