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Monthly Average UV IndexUnited States maps | International maps and data The ozone layer shields the Earth from harmful UV radiation. Seasonal and weather variations cause different amounts of UV radiation to reach the Earth at any given time. The maps below show monthly average UV radiation intensity for the United States. The average amount of UV radiation is given in terms of the UV Index, a scale of 1-11+ developed by the National Weather Service (NWS) and EPA to help people choose sun-protective behaviors. For comparison with U.S. averages, visit the links to UV Index maps and values in other parts of the world. Click a month name to see the UV Index map for that month.
January Average UV IndexFebruary Average UV IndexMarch Average UV IndexApril Average UV IndexMay Average UV IndexJune Average UV IndexJuly Average UV IndexAugust Average UV IndexSeptember Average UV IndexOctober Average UV IndexNovember Average UV IndexDecember Average UV Index
International UV Index InformationThe Web sites listed below have UV Index average values for locations around the world. These are all non-EPA sites.
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