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A chance for rain and snow
A bit of snow and rain
Cloudy to partly sunny
A thick cloud cover
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of sunlight, then sets at
of moolight, then sets at
While blustery winds will howl on Christmas Day, Philadelphia will continue to escape more typical winter cold until next 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.