Illinois State Water Survey Illinois State Climatologist

Illinois Was the Wettest State in the US in June

The National Centers for Environmental Information (formerly NCDC) released their numbers for June, showing that Illinois did indeed have its wettest June on record with 9.30 inches (according to their calculations). That made Illinois the wettest state** in the US for the month. Here are the national maps showing the statewide precipitation values for June […]

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Wettest June and Now Second Month on Record for Illinois

According to the rainfall reports through yesterday (6/29), the statewide average precipitation is now 9.37 inches. The old record for June was 8.27 inches set in 1902. The current 9.37 inches beats the old record by 1.10 inches. The current 9.37 inches is 5.17 inches above the June average of 4.20 inches. The current 9.37 inches […]

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Heaviest Reported 24-Hour Rainfall in Illinois – A Look Back at Records

The current record for the heaviest 24-hour rainfall total in Illinois is 16.94 inches at the NWS cooperative observer gauge in Aurora on July 17-18, 1996. An entire Water Survey report was written on the storm that produced this record. The previous record 24-hour rainfall was 16.54 inches set on June 14-15, 1957, near Millstadt […]

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