Prior to 1940, July 11 was a very hot day in the US, but July 11 temperatures have plummeted over the last 80 years.
On July 11, 1936 most of the eastern US was over 100 degrees, and 110 degree temperatures were recorded in West Virginia, Indiana, Illinois, Wisconsin, Minnesota and the Dakotas.
Compare vs. the official NOAA hottest year ever of 2016, which had very little hot weather outside the desert southwest.
