I lived for 15 years in Illinois and people would be freaking out if it got to 45C. For context 113F (~45C) looks to be the highest temperature ever recorded in Peoria (which is in central Illinois). The average high there in the hottest month (July) is only 86F (30C). Even in Illinois this would break temperature records (not to mention that the temperatures I quoted are also a fair bit south of the latitude they said).

Edit: Honestly the Midwesterners who would take that heat the best would probably be Minnesotans as it would be a great excuse to be on all of those lakes they are always telling me about.