The US has had some very hot July 21st’s. July 21st, 1901 – the average afternoon temperature around the US was 95 degrees, and the Chicago area was 110 degrees.
22 Jul 1901, 1 – Chicago Tribune at Newspapers.com
July 21, 1930 was the hottest day on record in Washington DC (106 degrees) and Delaware (110 degrees.)
July 21, 1934 was the hottest day on record in Ohio (113 degrees.)
via The Deplorable Climate Science Blog
July 21, 2018 at 04:32AM
Iowa Climate Science Education 