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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.
The average annual snowfall amount is 37 inches (949 mm). Average daily highs are around 30 - 38Â°F (-1Â°C - 3Â°C). Springtime in Chicago means blooming flowers and a lively lakefront. Temperatures really start to warm up with April typically in the 50's Â°F (10-15Â°C) and May up to around 70Â°F (21Â°C). Rainfall averages 3.5 - 3.8 inches (92 - 94mm). Summers in Chicago are warm with average daytime temperatures around 78Â°F to 92Â°F (26Â°C - 33Â°C). Rainfall averages range from 3.7 - 4.3 inches (94 to 109mm). It's cooler near the lake, and June is typically the wettest month of the year.