Midwest is very unstable weather-wise because it’s wide open to both wet and hot air from the Caribbean and cold and dry air from the arctic. In the winter the jet stream drops down to lower altitude, and due to climate change there are signs that it’s actually weakening which allows for more frequent/deeper blobs of arctic air dropping far south; those fronts collide with warm air, push it up, drain it of moisture and once stabilized bring cold but sunny days.