The UV Index is an International scale

Just as the Beaufort Scale rates wind intensity, the UV Index ranks the UV radiation levels and the risks for human health.  The UV Index is approved and recommended by international organizations such as the World Health Organization (WHO) and the World Meteorological Organization (WMO).  The UV Index communicates values for two- to four-hour periods around solar noon.

UV Forecast  plus  Forecast Map and UV Alert Map



11 and more Extreme
8 /10 Very high
6 / 7 High
3 / 5 Moderate
1 / 2 Low

The latitude, altitude, time of day, time of year, ozone conditions, and degree of cloudiness are all important factors of solar UV intensity variations.

Recommendations for children and for sensitive skin
(read and print/download)

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