Chicago, IL – The summer of 2025 closed out with warmer-than-usual temperatures across northern Illinois, with rainfall totals coming in close to seasonal averages.
According to the National Weather Service Chicago, the three-month meteorological summer period of June through August brought average temperatures of 75.0 degrees at O’Hare International Airport, which was 1.8 degrees above normal. Rockford recorded 73.3 degrees, about 1.4 degrees above normal. Rainfall varied slightly, with Chicago receiving 12.95 inches, or 0.89 inches above normal, while Rockford saw 13.17 inches, coming in 0.06 inches below normal.
August, however, told a different story. The weather service reported that average monthly temperatures dipped slightly below normal. Chicago posted an average of 73.3 degrees, or 0.5 degrees below normal, and Rockford came in at 70.6 degrees, 1.3 degrees below normal. Rainfall totals showed contrast between the two cities. Chicago measured 5.03 inches of precipitation, 0.78 inches above normal, while Rockford collected 3.30 inches, 0.89 inches below normal.
The maps released by the weather service highlighted the regional differences in both temperature and precipitation patterns across northern Illinois. Much of the state saw warmer-than-average conditions through the summer, while rainfall varied widely depending on location.
Officials noted that while summer wrapped with temperatures consistently above normal overall, the month of August provided some relief with slightly cooler readings. The precipitation differences reflected localized storm activity common during the late summer season.
This seasonal summary serves as a precursor to the upcoming fall forecast, with meteorologists continuing to monitor temperature and rainfall trends heading into September.
This article was produced by a journalist and may include AI-assisted input. All content is reviewed for accuracy and fairness.
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