There have been no 100 degree temperatures reported in the midwest this summer. Climate Central defines the midwest as Minnesota, Wisconsin, Illinois, Iowa, Indiana, Ohio and Michigan.
One hundred degree days used to be very common in the midwest, and during the summer of 1936 almost 20% of afternoons were over 100 degrees. There have been no 100 degree readings this summer.
The only recent year which had a lot of 100 degree readings was 2012. All of the other hot summers were below 350 PPM CO2.