Illinois State Water Survey Illinois State Climatologist

April in Illinois Was Warm, Wet, & Wild

The preliminary statewide average April temperature was 58.8 degrees, 6.2 degrees above the 1991–2020 normal, 7.3 degrees above the 20th Century average, 6.0 degrees above the most recent 30-year average. Last month was the warmest April on record in Illinois. The preliminary statewide total April precipitation was 6.37 inches, 2.13 inches above the 1991–2020 normal, […]

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January – Wild Temperature Swings and Dry

Summary: January in Illinois finished out at 26.7 degrees, 0.3 degrees above average. Both precipitation and snowfall were below average. The statewide average precipitation (rain plus water content of snow) was 0.85 inches, 1.22 inches below average. Snowfall was below average across most of the state. Temperature The temperatures in January in Illinois showed some […]

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October Warmer and Drier than Average in Illinois

October ended up warmer and drier than average in Illinois. The statewide average temperature was 55.8 degrees, 1.7 degrees above average. The statewide average precipitation was 1.47 inches, 1.79 inches below average and the 22nd driest October on record. Even so, there were a few areas on the border with Iowa and Kentucky that received […]

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Cool, Dry August and Sixth Wettest Summer in Illinois

August was cool across the state and dry in most places in Illinois, capping off a summer that was cool and wet. Precipitation The statewide average precipitation for August in Illinois was 2.95 inches, 0.64 inches below average.  However, this was followed by a very wet June with 9.44 inches, and a wet July with […]

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