This is "if you go outside you will have frostbite in minutes" type cold, this is "your car may not start up" type cold, this is "your schoolboard should be advising you not to send your kids to school by foot" type cold, i live in Ontario and I've only ever seen it get to -44C here.
If you are in this swath of area and have never experienced this type of cold before please take whatever precautions you can. in extreme circumstances like this the best way to do that is to isolate activity to one or 2 rooms of the house that have as few outward facing windows as possible, make sure you wear lots of layers and even insulate those layers by putting wadded up paper between them, keep your extremities covered, keep your face covered, if you have blankets or pillows to spare and non-carpet flooring lay those out to help insulate the room, you can hang bath towels in front of any windows to help absorb the cold. Please limit going out to as little as possible, and if you have to make sure anything that can be covered is indeed covered, if you have to wear denim please layer something underneath it, wear ur heaviest fabrics, double up on socks and gloves if you need to, if you can get thermal underwear you can always layer those. When in highschool and had to wait at the buss I would often microwave some potatoes or perogis and keep them in my pockets to warm my hands as I waited for the bus. Keep extra blankets and candles and clothes in ur car. For whatever reason if you get wet and you're outside, please find somewhere to get inside while you dry. If you live in an area that's getting this and you don't have winter clothes like scarves or mitts take whatever thick insulating cloth you can find and use that instead. it might not be comfortable but it will be better than frostbite, I promise.
This is the type of cold that also comes in insanely dry so if you are prone to nosebleeds this will be a problem. Make sure you have moisturizer for ur hands and lip balm so you don't end up cracked and bleeding on top of freezing, its a shit combo.