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Clouds and sun; less humid
Partly sunny and nice
Sun mixing with clouds
Periods of sun with a shower
Following the thunderstorms of early in the week, Philadelphia will see cooler and less humid air midweek. 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.