There have been 11,500 summer days since 1895. July 18, 1936 was the hottest and the only one which averaged 100 degrees (99.6F) in the western US.

It was also the hottest July 18 across the entire country.

Three states reached 118 degrees (Kansas, Missouri and Oklahoma) nine states were over 110 degrees, and twenty seven states were over 100 degrees.

States over 100F (38C) on July 18. 1936.
State Temperature (F)
Kansas 118
Missouri 118
Oklahoma 118
Arizona 113
Arkansas 113
Nebraska 113
Montana 111
California 110
South Dakota 110
Idaho 109
North Dakota 109
Texas 109
Utah 109
Colorado 108
Minnesota 107
Nevada 107
Iowa 105
Wyoming 105
Washington 104
Illinois 103
New York 103
Mississippi 102
Virginia 102
New Mexico 101
Oregon 101
Ohio 100
Wisconsin 100
Meanwhile, the Denver Post says the Denver Airport could reach 100 degrees tomorrow, which they say would be near an all-time record and would be due to global warming.
One hundred degrees actually happens almost every year at the Denver airport, and is five degrees cooler than the 105 degrees downtown Denver reported on August 8, 1878. A record that has never been beaten, despite the fact that the airport site is three to five degrees warmer than downtown.
The breathtaking level of ignorance and stupidity among climate reporters, seems to know no bounds.