Maybe that was a heat index or something like that. Temp was no more than 100 peak and got into the mid-80s by 9pm, and it got much more comfortable overnight because of a big drop in humidity.
The issue with Minnesota is that we are set up for anything related to cold: homes designed for it, furnaces, snow plows, and people who grow up knowing how to deal with it. We aren't set up for heat, though. A lot of homes don't have air conditioning because we seldom need it.
It's funny to go South where people think 30 degrees is cold, and then go to Minnesota where people think anything over 80 is really hot.
My wife is a native Minnesotan and it took me about ten years of persistent effort to get her to understand what a fan actually does and how it should be used.