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.