A strong cold front will sweep through southern Wisconsin early Monday with sharply colder air building in with Arctic high pressure. High temperatures for the day will be reached early in the morning, then fall through the afternoon. Light rain, changing over to a rain/snow mix , will accompany the frontal passage, going over to light snow showers or flurries as the precipitation comes to an end late in the afternoon. The map below shows the expected weather features Monday morning.
Here's a map showing the timing of the best chance of rain/snow early Monday. Right now it looks like a few tenths of an inch of slushy snow could accumulate on grassy areas, with isolated amounts up to 1/2 inch.
A broad and cold area of high pressure will settle over the central U.S. for the first part of the week. The map below shows the expected position of the center of the high over Nebraska, with northwest winds pushing the cold air across Wisconsin.
The Arctic-origin high will control the weather for most of next week, with well-below normal temperatures through Wednesday before moderating slightly toward the end of the week. High temperatures on Tuesday will be closer to, and possibly below, normal LOW temperatures for the date!
The tables below show the normal and forecasted high temperatures and low temperatures for the upcoming week.