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Partly sunny and pleasant
Sunny to partly cloudy
Plenty of sunshine
of sunlight, then sets at
of moolight, then sets at
Rainfall will be scarce around Washington, D.C., this week, but cool air will be plentiful. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.