Quote:
Loma, Montana boasts as having the most extreme recorded temperature change in a 24-hour period. On January 15, 1972, the temperature rose from -54 °F (-48 °C) to 49 °F (9 °C), a 103 °F (57 °C) change in temperature; a dramatic example of the regional Chinook wind in action.

The Black Hills of South Dakota are home to the world's fastest recorded rise in temperature. On January 22, 1943, at about 7:30am MST, the temperature in Spearfish, SD was -4 °F (-20 °C). The chinook kicked in, and two minutes later the temperature was 45 °F (7 °C) above zero. The 49 degree (27 °C) rise in two minutes set a world record that is still on the books. By 9:00am, the temperature had risen to 54 °F (12 °C). Suddenly, the chinook died down and the temperature tumbled back to -4 °F. The 58 degree drop took only 27 minutes.