Illinois State Water Survey Illinois State Climatologist

Cool and Dry Start to Winter

The preliminary statewide average December temperature was 29.1 degrees, 2.5 degrees below the 1991–2020 average and tied for 53rd coolest on record going back to 1895. The preliminary statewide average total December precipitation was 1.50 inches, 0.93 inches above the 1991–2020 average and the 29th driest on record statewide. Data are provisional and may change […]

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Fall Ended and Winter Really Began in November

The preliminary statewide average November temperature was 43.6 degrees, 1.4 degrees above the 1991-2020 average and the 32nd warmest November on record. The preliminary statewide average total November precipitation was 2.14 inches, 0.94 inches below the 1991-2020 average and the 45th driest on record statewide. Data are provisional and may change slightly over time. Mild […]

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A Warm and Dry October Ushers in Real Fall

The preliminary statewide average October temperature was 59.6 degrees, 4.8 degrees above the 1991-2020 average and tied for 9th warmest on record going back to 1895. The preliminary statewide total October precipitation was 2.61 inches, 0.65 inches below the 1991-2020 average and the 67th driest on record.   Data are provisional and may change slightly […]

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