July 19, 1936 was the hottest day on record in Oklahoma at 120 degrees, and the second hottest day on record in the western US. It was one of only two days which the western US averaged above 99 degrees, the other day being July 18, 1936.
Twenty five states were over 100 degrees that day, and eight states were over 110 degrees.
State Peak Temperature on July 19, 1936 ----- --- Oklahoma 120 Arkansas 114 South Dakota 114 Texas 114 Arizona 111 Kansas 111 California 110 Missouri 110 Colorado 109 Idaho 109 Nebraska 109 New Mexico 108 Nevada 107 Utah 107 Montana 106 Oregon 106 Iowa 104 Washington 104 Wyoming 104 North Dakota 102 Illinois 101 Mississippi 101 Indiana 100 Minnesota 100 Tennessee 100