Monthly Average UV Index

United 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.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

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

http://www.arpansa.gov.au/uvindex/models/ausuvmodels.htm
http://www.bom.gov.au/bmrc/mdev/expt/uvindex/lld-uvindex/uvindex-cities.nobureauheader.html

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://i115srv.vu-wien.ac.at/uv/uv_link01.htm
(This site has links to numerous country-specific UV Index sites.)
http://uv.colorado.edu/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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