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Very windy; clouds breaking
A passing morning shower
Some sun; breezy, colder
of sunlight, then sets at
of moolight, then sets at
After a springlike start to the week in Philadelphia, a sharp change to frigid weather will come for Thursday. more >
Nov 12, 2012; 5:00 AM ET
The UV index has been around since the early 1990s. It was created to help you plan outdoor activities in hopes to limit overexposure to the sun. Jeannette Calle has more.