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Monthly average UV Index

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 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 Index

Shading colors on a U.S. map show average UV Index values for January

February average UV Index

Shading colors on a U.S. map show average UV Index values for February

March average UV Index

Shading colors on a U.S. map show average UV Index values for March

April average UV Index

Shading colors on a U.S. map show average UV Index values for April

May average UV Index

Shading colors on a U.S. map show average UV Index values for May

June average UV Index

Shading colors on a U.S. map show average UV Index values for June

July average UV Index

Shading colors on a U.S. map show average UV Index values for July

August average UV Index

Shading colors on a U.S. map show average UV Index values for August

September average UV Index

Shading colors on a U.S. map show average UV Index values for September

October average UV Index

Shading colors on a U.S. map show average UV Index values for October

November average UV Index

Shading colors on a U.S. map show average UV Index values for November

December average UV Index

Shading colors on a U.S. map show average UV Index values for December

International UV Index information

The Web sites listed below have UV Index average values for locations around the world. These are all non-EPA sites.

Australia

Canada

http://www.msc.ec.gc.ca/topics/uv/uv_climatology_e.html

Hong Kong

http://www.hko.gov.hk/wxinfo/uvindex/english/edailymeanmax.htm

World

http://www.temis.nl/uvradiation/GOME/uvmonth.php?fb=uviec
(These maps give clear sky UV Index, which does not account for cloudiness.)
http://cires.colorado.edu/websites/uv/lindex.html
(This site has links to numerous country-specific UV Index sites.)
http://wwwa.accuweather.com/world-maps-health.asp?partner=accuweather&myadc=1&traveler=0
(This site has UV Index forecasts for every region of the world.)

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