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Hourly Forecast Detailed. 1  0am:The Winnebago, IL forecast for Mar 14 is 21 degrees and Light snow. There is 87 percentage chance of rain and 14 mph winds from the North-Northeast. 2  3am:The Winnebago, IL forecast for Mar 14 is 19 degrees and Partly cloudy. There is 86 percentage chance of rain and 13 mph winds from the North.
Typical dates of the last inch of snow range from March 26 (north) to three weeks earlier, March 5 (south). The average number of days with a measurable snow depth (1 inch or more) drops noticeably from 60 days (northwest) to only 10 days (southwest). Flooding is the single most damaging weather hazard in Illinois.he highest and lowest temperatures ever reported in Illinois were 117Â° F in East St. Louis on. July 14, 1954, and -36Â° F at Congerville on January 5, 1999. Precipitation-Average annual precipitation increases from less than 32 inches (north) to over 48. inches a year (south).