On the summer of 1936 happened the deadliest heat wave of U.S history. With 5000 people dead, the great heat wave was divided into two phases, the first one was formed on July 6th. It began on North Midwest and moved northeast to Southern Ontario and hit eight states on U.S ( IL, IN, IA, MI, MN, MO, WI, OH ), leaving a total of 3959 fatalities. This wave was destroyed on 16th of July when a cold front moved into that region and scoured all the hot air, but at the same day the heat reloaded on Southern Midwest and moved down to the South and West of U.S, this was a much longer ( until late August ) and intense heat wave, but not that successful since the geographical area that it hit was much more urbanized. The Great Heat Wave of 1936, set up many all time records of temperature in US, counting 15 states for that. It also set up records as the warmest summer since 1895, with an average of 74.6 degrees Fahrenheit and July as the single warmest month ever recorded with a mean of 77.4 degrees Fahrenheit.