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Rain and drizzle; much colder
Windy with variable clouds
Mostly sunny and chilly
Chance of a shower
Mostly cloudy and breezy
of sunlight, then sets at
of moolight, then sets at
Unseasonably cold conditions will hold in the Philadelphia area through this weekend, before temperatures moderate early 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.