ASK TOM: How many times have there been three consecutive days with the same high and low temperatures in Chicago?

Dear Tom, 

You recently discussed the instances in which Chicago had two consecutive days with the same high and low temperatures. Something like 200 pairs of days. How many times have there been three consecutive days with the same high and low temperatures? Four days? More?

—Rick Landers

 

Dear Rick,

A search through Chicago’s temperature records from 1871 to the present indicates 294 pairs of days with identical high and low temperatures, or an average of two occurrences per year.

 

Another search for three consecutive days with identical maximum and minimum temperatures yielded only four events: Aug. 11-13, 1879, each day with high/low temperatures of 82/65 degrees; Aug. 26-28, 1882, 74/70; Sept. 5-7, 1910, 81/68; and, most recently, Nov. 22-24, 1920, 42/37. Four consecutive days of identical temperatures has never occurred.

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