Yeah, extreme low temps hardens up seals, and makes them more prone to blow, eg air shocks/forks.
I've had hayes hfx9 blow out on me in -20ish degC (ie all the fluid got pumped out past the master cylinder seal in the lever), then when I got home and filed/bled them they were fine.
Friends have had air shocks fail.
This is well below zero though!
Note that rebound compression circuits become super slow in cold weather too!
We just had a decent snow fall so "hero" conditions are likely done for the year...
(hero = light dusting of snow and frozen dirt = super fast grippy riding)