Illinois State Water Survey Illinois State Climatologist

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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Illinois Drought Update

Below normal rainfall has continued into fall and has both expanded and worsened drought conditions across the state. Dry vegetation and crops have caused dozens of field fires over the past two weeks. Multiple rivers have hit low- or no-flow, including the Sangamon and Vermilion, and some municipalities have begun to enact voluntary water conservation […]

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Fall Begins with a Warm and Very Dry September

The preliminary statewide average September temperature was 68.8 degrees, 2.0 degrees above the 1991–2020 average and tied for the 27th warmest on record going back to 1895. The preliminary statewide total September precipitation was 2.60 inches, 0.75 inches below the 1991–2020 average and the 41st driest on record. Data are provisional and may change slightly […]

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August Ushered us From Summer to Fall

The preliminary statewide average August temperature was 73.7 degrees, 0.1 degrees above 1991-2020 average and tied for the 59th warmest on record going back to 1895. The preliminary statewide average total August precipitation was 1.87 inches, 1.69 inches below the 1991-2020 average and tied for the 9th driest on record statewide. Data are provisional and […]

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