Minnesota can and has gotten extremely hot and humid to the point it can reach sub-tropical level, far more often than people think.
I landscaped in 98 degrees with 90 percent humidity. You adjust to it , IF, it is a long lasting weather spell.
I believe 2011 was the summer in the past 15 years where it stayed for the longest time, although that was back in the days before talking weather heads started babbling about if you go outside you die, so stay indoors.
When I was younger, Bud Kraehling would just say - It is hot out there , be careful.