The U.S. is sweltering. The heat wave of 1936 was far deadlier.
The killer U.S. heat wave of 1936 spread as far north as Canada, led to the heat-related deaths of an estimated 5,000 people, sent thermometers to a record 121 degrees Fahrenheit in Steele, N.D., and made that July the warmest month ever recorded in the United States.
https://www.washingtonpost.com/history/2022/07/20/heat-wave-1936/