Weather Alerts For Marengo, IL

Special Weather Statement National Weather Service Chicago/Romeoville IL 418 AM CST Tue Dec 9 2025 Winnebago-Boone-McHenry-Ogle- Including the cities of Rockford, Belvidere, Crystal Lake, Algonquin, McHenry, Woodstock, Rochelle, Oregon, and Byron 418 AM CST Tue Dec 9 2025 ...Slippery Travel Conditions Possible Early This Evening... Rain falling onto a sub-freezing ground may result in a glaze of ice on untreated surfaces early this evening in areas mainly north of a Dixon to McHenry, Illinois line, including the Rockford metro area. Be prepared for the possibility of slippery travel conditions for the latter half of the evening commute.