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Partly sunny; breezy, colder
Warmer with periods of sun
Clouds and sun with a shower
of sunlight, then sets at
of moolight, then sets at
Cooler-than-normal temperatures are in store for Chicago this week. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.