According to Environment Canada:
"Extreme wind chill values of -40 to -50 continue this morning in most of southern and central Saskatchewan, courtesy of an Arctic high-pressure ridge that has settled in over the area. Very cold weather will prevail most of the province through the weekend and most of next week.
Extreme cold puts everyone at risk. Keep emergency supplies in your vehicles such as extra blankets and jumper cables. If it's too cold for you to stay outside, it's too cold for your pet to stay outside. Extreme cold warnings are issued when very cold temperatures or wind chill creates an elevated risk to health such as frostbite and hypothermia."