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HIGH: 58

LOW: 40

– Final day of this autumn’s first significant cool spell.

– Extensive cloudiness at the start with possible light showers–especially lakeside.

– Clouds break during the afternoon allowing some passing sunshine.

– Continued cool with highs 10 degrees below normal.

– Northeast winds shift more easterly later in the day averaging 5-15 m.p.h.

– Clearing and colder Friday night. Some patchy frost possible well inland. Coldest inland lows: mid-30s.

OCT. 3 TEMPERATURES

Normal high/low: 68(degrees)/47(degrees)

Record high: 91(degrees) (1954)

Record low: 29(degrees) (1981)

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Weather Report is prepared by the WGN-TV Weather Center, where Tom Skilling is chief meteorologist. His forecasts can be seen Monday through Friday on WGN News at 11:30 a.m., 5:30 p.m. and 9 p.m.

WGN-TV meteorologists Steve Kahn, Richard Koeneman and Paul Dailey plus weather producer Bill Snyder contribute to this page.

IN THE WEB EDITION: For updated weather news, forecasts by ZIP code and local radar images, go to chicagotribune.com/weather or wgntv.com