On this date in 1901, it was 109 degrees in Wisconsin. June 28th heat has plummeted in the US over the past century, with the five hottest years being 1931, 1934, 1936, 1933 and 1901.
100+ degree temperatures used to be much more common, and hotter in the Midwest.
The US has become accustomed to cool weather, but summers used to be very hot here.
