1911–12 United States cold wave

The cold wave started in November 1911 and finally ended in March 1912, with periodic interruptions by milder temperatures.

The cold wave began in November 1911 when the Great Blue Norther dropped temperatures abruptly.

[7] Sioux Falls, South Dakota dropped to −38 °F (−38.9 °C) on January 12, which tied the city's third-lowest temperature since records started in 1893.

[9] The cold was so severe that Niagara Falls froze over completely at one point, forming an ice bridge.

[16] These cold waves led to the first use of electric heaters and special sheds to protect against frosts and freezes.