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Chicago Tribune
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Chicago has only logged two 90-degree days so far this summer, with the possibility of a third Tuesday. From 1981 to 2010, Chicago summers have had an average of 14 90-degree days, said Jamie Enderlen, a meteorologist with the National Weather Service.

Officials have issued an air quality alert. Read more here.

90+ DEGREE DAYS BY SUMMER

Temperatures measured at O’Hare International Airport

HIGH TEMPERATURES THIS SUMMER IN CHICAGO

Temperatures at O’Hare compared to normal highs.