Reports are saying -9/-10.
Basically same thing happened here just over a week ago, winter came and turned the rain to snow at 11:59 Oct 31. Temps dropped 10-15 degrees and have stayed that way. FWe've been averaging 10-15 degrees every day for quite while now, so the temp dropping 20 degrees rapidly is a bit of a shock.
Having lived in Alberta for most of my life and then moving to Ontario, I will say that comparing how cold it feels based on temperature alone can be very misleading. For example, I would rather have -20 degrees in Alberta than -10 degrees in Southern Ontario. Because of the humidity, that -10 feels bone-chilling. Add a bit of wind and you are running for cover pretty quickly.lol wuss. That's been our daytime highs for 2 weeks now.