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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.
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January average UV Index
February average UV Index
March average UV Index
April average UV Index
May average UV Index
June average UV Index
July average UV Index
August average UV Index
September average UV Index
October average UV Index
November average UV Index
December average UV Index
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
Hong Kong
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.)