Coldest April Fool's Day in 20 Years: Chicago, Duluth

The arctic invasion headed to the Midwest early next week will lead to the coldest April Fool's Day in years, even decades for some.
This Easter weekend will start with high temperatures near or above normal across the Midwest, but will end with arctic air plunging into the Upper Midwest on Sunday.
A noticeably colder Monday then awaits the rest of the Midwest as the cold blast continues its journey to the south and east, eventually reaching the East and Gulf coasts by Wednesday (but not including the Florida Peninsula).
Highs on Monday throughout the Midwest will be held to the 30s north of the Ohio River with temperatures failing to crack the 30-degree mark from northern and eastern North Dakota to northern parts of Michigan.



http://www.accuweather.com/en/weather-news/coldest-april-fools-day-in-20/9111879