Illinois State Water Survey Illinois State Climatologist

An Extremely Warm September has us Wondering, Where is Fall?

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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Mild October Had a Chilly End

The preliminary statewide average October temperature was 56.7 degrees, 1.9 degrees above the 1991–2020 average and tied for the 31st warmest on record going back to 1895. The preliminary statewide total October precipitation was 3.46 inches, 0.20 inches above the 1991–2020 average and the 41st wettest on record. Data are provisional and may change slightly […]

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Forecast for October, Fall, and Winter – Warmer Than Average

The NWS Climate Prediction Center released their latest outlook for October and beyond. It looks like the warm-than-average weather is expected to continue for the next several months. The primary driver in the forecast is the ongoing El Niño in the Pacific Ocean basin. October Illinois has an increased chance of above-average temperatures for October. […]

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