- Who
- Spearfish
- What
- 27 degree(s) Fahrenheit
- Where
- United States (Spearfish)
- When
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.
