The Chicago area typically sees its first trace of snow Oct. 31, Roman said. The area's first measurable snow -- 0.1 of an inch or more -- usually comes Nov. 18, Roman said, and the area's first average snow of one inch or more typically occurs Dec. 7.

Low pressure is moving across the area Thursday morning, bringing periods of showers, drizzle, and fog that are expected to last until around noon.

CHICAGO - Rain is moving into Chicagoland Wednesday evening ... There is a small chance for a few showers on Sunday, but most areas stay dry. A more active weather pattern is on tap for next week. Monday will be partly sunny with the chance of rain ...

Rain returns Wednesday night in Chicago. Wednesday will be a mostly dry day with some sunshine. Highs will be slightly milder int he mid 50s. Rain moves in after dark and lingers into the night. The bulk of the rain is expected to end early Thursday morning.