The image says it all. Cold temperatures will be making an appearance, with most of the state seeing readings beginning with a minus sign in front of it, with a few locations seeing readings with a minus sign in front and more than 1 digit after. This cold snap is expected to last Sunday through about Tuesday of next week before a rapid warmup is expected by late next week where temperatures may approach average again by the following weekend.
Note the projected -20° at Sparta and Camp Douglas WI!