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Sun and some clouds
A couple of thunderstorms
Cloudy with a thunderstorm
Warmer with a few showers
Mostly sunny, nice and warm
of sunlight, then sets at
of moolight, then sets at
The month of May has opened the door for warm air to flow into the Chicago area following a cool end to April. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.