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===World record temperature change=== Spearfish holds the world record for the fastest recorded temperature change. On January 22, 1943, at about 7:30 a.m. [[Mountain Time Zone|MST]], the temperature in Spearfish was {{convert|−4|°F}}. The [[Chinook wind]] picked up speed rapidly, and two minutes later (7:32 a.m.) the temperature was {{convert|+45|°F}}. The {{convert|49|F-change|C-change|disp=or}} rise in two minutes set a world record that still holds. By 9:00 a.m., the temperature had risen to {{convert|54|°F}}. Suddenly, the Chinook died down and the temperature tumbled back to {{convert|−4|°F|°C|disp=or}}. The {{convert|58|F-change|C-change|1|disp=or}} drop took only 27 minutes.<ref>[http://www.crh.noaa.gov/fsd/?n=fsdtrivia01 "South Dakota Weather History and Trivia January"]. – [[National Oceanic and Atmospheric Administration]]'s [[National Weather Service]].<br>—Appendix I: – [http://www.wrh.noaa.gov/sgx/research/Guide/weatherextremes.pdf "Weather Extremes"] {{webarchive|url=https://web.archive.org/web/20080528065516/http://www.wrh.noaa.gov/sgx/research/Guide/weatherextremes.pdf |date=May 28, 2008}}. – [[National Oceanic and Atmospheric Administration]]. – (Adobe Acrobat *.PDF document).</ref><ref>Parker, Watson (1981). – ''Deadwood: The Golden Years''. – Lincoln, Nebraska: The University of Nebraska. – p.158. – {{ISBN|978-0-8032-8702-0}}.</ref><ref name="The Black Hills Remarkable Temperature Change of January 22, 1943">{{cite web |title=The Black Hills Remarkable Temperature Change of January 22, 1943 |url=https://www.weather.gov/unr/1943-01-22 |website=Weather.gov |access-date=April 11, 2020}}</ref> The sudden change in temperatures caused glass windows to crack and windshields to instantly frost over.<ref>{{cite web|url=http://www.crh.noaa.gov/unr/?n=01-22-43-spearfish-temperatures|title=Rapid City, SD|first=US Department of Commerce, NOAA, National Weather|last=Service|access-date=March 28, 2017}}</ref><ref name="The Black Hills Remarkable Temperature Change of January 22, 1943" /> Extreme winter maxima in the district are remarkably warm given the latitude and altitude; on January 19, 1921, Spearfish reached a temperature of {{convert|79|F}}, the hottest January temperature in South Dakota on record.<ref>{{cite web|title=South Dakota: Temperature Extremes |url=http://www.infoplease.com/ipa/A0930254.html |access-date=March 28, 2017}}</ref>
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