Nebraska has recorded 302 days since 1890 with the statewide average maximum temperature above 100F. Eighty percent of those days occurred before 1960, with the hottest being July 25, 1936 when the state averaged 111F.
“Perhaps the hottest night ever recorded in the U.S. outside of the desert Southwest, occurred on the evening of July 25, 1936, at the unlikely location of Lincoln, Nebraska, when the minimum temperature fell to only 91°”