Chicago’s begin to rise today, then rise considerably higher Wednesday through Friday. Highs today, although warmer than Monday’s 39 degrees at O’Hare International Airport, will still be about 10 degrees below the normal high of 57 degrees. But temperatures by Friday afternoon will hit the lowers 70s, although a sharp cool-down takes place on Saturday as another chilly surge hits the city and lasts for at least a few days. Afternoon high temperatures on Sunday and Monday will be the middle 40s and nighttime lows in the upper 20s, readings more like in early or middle March. Showers and thunderstorms will accompany the return of colder air Friday and Saturday. It dries out with the arrival of colder air by late Saturday, and dry weather but chilly temperatures are forecast for Sunday and Monday.
Chicago rides a temperature roller coaster

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Chilly St. Patrick’s Day could start wintry
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Winter-like weather will last the weekend; Snow possible
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Strong winds bring a brief push of milder air
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First weekend of March brings pleasant weather
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Spring still a no-show as chill continues
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How can it snow when temps are in the 40s?
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East Coast braces for a deep freeze following massive storm
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Wild weather ahead-from 60s to snow
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Winter Weather Advisory in effect until 1PM CDT Sunday for glazing from freezing rain and sleet in Winnebago, Boone, McHenry and Lake Counties in northeastern Illinois
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Chilly air to linger before weekend warm-up
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Cold, snow follow rare January thunderstorms
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Sub-normal temperatures to last into next week
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Spring opens with February-level temperatures