The Ultraviolet (UV) Index, developed in 1994 by the National Weather Service (NWS) and the U.S. Environmental Protection Agency (EPA), helps Americans plan outdoor activities to avoid overexposure to UV radiation and thereby lower their risk of adverse health effects. UV radiation exposure is a risk factor for skin cancer, cataracts, and other illnesses. The incidence of skin cancer, including melanoma, has increased significantly in the United States since the early 1970s.
Graphs of the UV Index forecast and "clear sky" UV Index forecast over the course of a year are available. Use the table of cities below to view a city's UV Index time series for a particular year. Each time series runs from January 1 through December 31. Within the graph, the ranges of exposure (minimal, low, moderate, high and very high) are colored. At the bottom of each graph is an accounting of the number of days the UV Index was in a certain exposure range.
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