The ultraviolet index or UV-Index (UVI) is
an international standard measurement of
the strength of sunburn-producing
ultraviolet (UV) radiation at a particular
place and time. The purpose of the UV
Index is to help people effectively protect
themselves from UV radiation. The UV
Index is a linear scale, with higher values
representing a greater risk of sunburn
(which is correlated with other health risks)
due to UV exposure. An index of 0
corresponds to zero UV radiation, as is
essentially the case at night. An index of 10
corresponds roughly to midday summer
sunlight with a clear sky when the UV
Index was originally designed, but values
above 10 are sometimes possible. Levels
above 8 are considered “very high” and
above 11 are considered “extreme.”
Wind chill (popularly wind chill factor) is
the lowering of body temperature due to the
passing-flow of lower-temperature air. In
other words, the air “feels” colder than it is
because of the chilling effect of the wind on
the skin.
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