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Mostly sunny and chilly
Cold with increasing clouds
Clouds and sun; not as cold
of sunlight, then sets at
of moolight, then sets at
After some springlike weather to kick off the week, winter weather will make a comeback in Chicago at midweek. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.