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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.
Illinois has a temperate climate, with cold, snowy winters and hot, wet summersâideal weather for corn and hogs. The seasons are sharply differentiated: mean winter temperatures are 22Â°F (â6Â°C) in the north and 37Â°F (3Â°C) in the south; mean summer temperatures are 70Â°F (21Â°C) in the north and 77Â°F (25Â°C) in the south.