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Mark T. Carroll is the president of CALM Weather LLC, a meteorological consulting service based in Oak Forest. For more information, visit
Contributing Editor
10:50 am CDT September 11, 2018
Through the end of August, there were 21 days with a maximum temperature of at least 90 degrees in 2018. The 21 days of 90 degree temperatures was the highest total we have had since 2012, when 46 days of 90-degree or higher temperatures. We normally have one 90-degree day each September.