Fastest temperature drop

At 9:00 a.m. on 22 January 1943, in the town of Spearfish in South Dakota, USA, the temperature fell from 54°F (12°C) to −4°F (−20°C) – a drop of 58°F (32°C) in just 27 minutes. Spearfish, South Dakota, also holds the record for the fastest temperature rise. On the same date, at about 7:30 a.m., the temperature was −4°F (−20°C). Two minutes later, the hot "Chinook" wind picked up speed rapidly and at 7:32 a.m. the recorded temperature was +45°F (+7°C) above zero. The rise was of 49°F (27°C).