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Sunshine and warmer
A couple of thunderstorms
Rain, then snow late; cooler
Sunny and breezy
An a.m. shower; mainly cloudy
of sunlight, then sets at
of moolight, then sets at
Though it will be a mild week for the Chicago area, thunderstorms, showers and even the chance for snow loom late in the 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.