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Fog in the a.m.; mostly sunny
Sunshine and patchy clouds
Mostly cloudy and comfortable
of sunlight, then sets at
of moolight, then sets at
Rainfall will be scarce around Boston 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.