Current temperatures in central Canada are as low as -25°. As high pressure responsible for Canada's cold shifts south into the High Plains Tuesday, it brings the cold air with it.
The air mass will be modified a little by the time it reaches the Stateline, but highs are expected to fall roughly ten degrees below average. It would be even colder if we still had a fresh snow pack on the ground.
Now if you're hoping for some snow to come with the cold, you're going to be out of luck. Between now and next week there look to be few and far between snow chances.