The statewide average September temperature was 73.0 degrees, 6.2 degrees above the 1991-2020 average, 6.8 degrees above the 20th century average, and 5.5 degrees above the most recent 30-year average. It was the warmest September on record in Illinois. The statewide total September precipitation was 3.01 inches, 0.34 inches below the 1991-2020 average, 0.49 inches […]
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