According to the National Weather Service in Boulder, after a high of 69°F at 2:27 p.m. on Sunday (Feb. 18) Denver’s official low hit -3°F just over 40 hours later at 6:45 a.m. on Tuesday (Feb. 20).

The 72 degree drop tied for the 8th biggest swing ever noted in a period of two days or less. It also landed in the top 20 biggest temperature swing events for Denver since records began in 1872.

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