South Dakota has the record for the fastest temperature change in the United States. Here are the facts:
Spearfish South Dakota holds the world record for the fastest temperature change. On January 22, 1943 at about 7:30 a.m. MST, the temperature in Spearfish was -4° degrees F (-20°C). The chinook wind picked up speed rapidly, and two minutes later (7:32 a.m.) the temperature was +45°F above zero (+7°C). The 49-degree rise (27°C) in two minutes set a world record that still holds. By 9:00 a.m., the temperature had risen to 54°F (12°C). Suddenly, the chinook died down and the temperature tumbled back to -4°F (-20°C). The 58-degree drop (32°C) took only 27 minutes.
This is why South Dakota is considered the State of infinite variety...