Dear Tom,

Chicago is known for its wild temperature swings. What is the city’s longest day streak with a peak of 70 degrees?

Sammy Rollins

Dear Sammy,

Chicago is famous for its large temperature swings during the day, often exacerbated in spring by the frigid waters of Lake Michigan. Earlier this May, mercury spiked in the ’80s and ’90s like summer after a few cold days in the ’50s. We asked Chicago climatologist Frank Wachowski to check the archives and he found the city’s longest period with a peak of 70 at 117, which lasted from May 29 to September 22, 2005. Mercury hit 70 degrees on May 29 and topped 70 degrees each days until September 23 when the peak was just 67. The hottest day during this period was a scorching 102 on July 24. The runner-up for 70 days or more was 110 from June 8. until September 25, 2016.

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