Parts of Saskatchewan and Manitoba are going to fee like -40°C Wednesday night, prompting Environment Canada to issue a series of wind chill warnings for eastern sections of the provinces.
In some places, the freezing temperatures will be accompanied with winds of up to 20 km/h, making it feel even colder.
The chill is expected to ease a bit on Thursday only to return during the evening, when the nightly low could plunge below -30°C.
At these extreme temperatures fostbite can occur in less than 10 minutes.
Visit the Canadian Cities Index to keep on top of watches and warnings across the country.