Extreme Heat

According to Accuweather.com, 26 of the 50 states set their all-time high temperature records during the 1930s that still stand (some have since been tied). An additional 11 state all-time high temperature records were set before 1930. Only two states have all-time record high temperatures that were set in the 21st century (South Dakota and South Carolina).

So 37 of the 50 states have an all-time high temperature record not exceeded for more than 75 years.