I mean, I've never been to South Bend, so I don't know if it's like Chicago. It is 20-30 miles away from Lake Michigan. You could be right. But I still remember Jazz Fest Chicago was one of the hottest and muggiest events I've ever been to. And I"ve been to a lot of oppressive OB and HRS games. It was similar to many of those.
All I'm saying is don't count on that being a decisive factor. I don't doubt players will be gassed and cramping up (possibly on both sides). For me, Beck, Bain, Toure and Co, their new QB and the hostile crowd and noise levels -- I'm banking the win on those reasons, not heat/humidity.