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Clouds giving way to some sun
Plenty of sun
Sunny and very warm
of sunlight, then sets at
of moolight, then sets at
After a brief reprieve from the heat on Tuesday and Wednesday, temperatures will again climb into the 80s late week in San Francisco. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.