A thick cloud cover
Rises at 7:57 AM with 11:47 of sunlight, then sets at 7:44 PM
Rises at 2:37 AM with 9:51 of moolight, then sets at 12:28 PM
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.