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Pleasant early; clear
Sunny and pleasant
Sun, some clouds
Variable clouds, a t-storm
Partly sunny and beautiful
of sunlight, then sets at
of moolight, then sets at
Monday is shaping up to be Philadelphia's warmest day so far this year, kicking off a week that will be dominated by summer warmth. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.