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Warmer with increasing clouds
Clouds limiting sunshine
Colder with partial sunshine
Colder with some sun
of sunlight, then sets at
of moolight, then sets at
Unseasonably cold conditions will hold in the Boston 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.