I don't care how tough you think you are, this...
Beginning late Thursday night, colder air will surge into the Upper Midwest from Canada as an arctic front races south. This front is expected to trek all the way to the Gulf Coast by early Saturday, bringing well below normal temperatures to much of the eastern two-thirds of the country. The cold air looks to be accompanied by gusty northerly winds on Friday in Minnesota and Wisconsin, and wind chills to the -25°F to -40°F range appear likely given the meteorological setup
...is not fun. Ask people who live in that ****. I know a few and they agree.
edit: usually you don't see that kind of weather up there until late Dec/Jan, so if you're playing the odds, you're probably not going to see that kind of weather - fortunately.