How were the maps created? The UV Index is calculated by a computer model which takes into account ozone concentrations, altitude, latitude, day and time of year, solar irradiance (incoming energy ...

Remember you can still get burnt on cool or cloudy days – so think UV, not heat. This example shows where you can find the UV information: There are also maps of UV Index inside our forecast viewer ...

Most of the country will also experience extreme ultraviolet or UV radiation levels at some point in the day. And this is the case pretty much all summer long. Loading... This is in contrast to ...