The fastest temperature change on record is a rise of 49 degrees (F). In two minutes, between 7:30 and 7:32 AM on Jan 22, 1943, in Spearfish, SD, the temperature rose from -4 to 45 degrees (F) !
VARIOUS SOURCES USED: The Book of Useless Information (Publications International, Ltd); Isaac Asimov’s Book of Facts (Wings Books); More Fascinating Facts (David Louis, Crown Publishers); Evan Swensen’s Publications Consultant newsletter; Explaining Space website; American Shrimp Processors Association; Parade Magazine: 105 Weird Facts; others from the web in some form.
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