Illinois State Water Survey Illinois State Climatologist

Warm and Smoky July

The preliminary statewide average July temperature was 77.1degrees, 1.7 degrees above the 1991-2020 average and tied for 35th warmest on record going back to 1895. The preliminary statewide total July precipitation was 3.41 inches, 0.65 inches below the 1991-2020 average and the 57th wettest on record. Data are provisional and may change slightly over time. […]

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Late December Heavy Rains, Flooding in Illinois

A large, slow-moving low-pressure system moved through the central US, bringing widespread, heavy rains to Illinois and neighboring state. This resulted in considerable flooding ranging from flooded basements to major flooding on the Mississippi River. Rainfall Maps for December 26-29, 2015 This first map shows the widespread heavy rains from Texas, Oklahoma, Arkansas, Missouri, Illinois, Kentucky, […]

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Response to Damaging Rains in Illinois: Monthly Rainfall Totals for Over 500 Sites

Recently, Illinois officials have sought a federal disaster declaration from USDA in response to the heavy rainfall and damaging flooding across Illinois during May, June, and July of 2015. Update August 12: all but one county in Illinois is eligible for federal agricultural disaster loans due to excess rain according to news reports.   In […]

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