March 30, 2021 1:52 pm UV Index: Why Does It Change Throughout the Year? How do UV rays change throughout the year and why is it possible to get a sunburn even when it’s cloudy? NBC 7 Meteorologist Sheena Parveen has everything you need to know about the UV index. US & World Videos 2:05 Male shot and killed, deputy injured in National City 2:01 Oceanside pier fire demolition to begin within weeks 1:44 Deputy injured, large police presence in National City 3:52 Family of man arrested after Oceanside emergency plane landing surprised 1:47 South Bay middle school students learn how to fly drones