UV Index 🇫🇷France

Metropolitan France stretches between roughly 42° and 51° N, from the Lavezzi islands off Corsica up to Bray-Dunes on the Channel coast, putting the country firmly in the mid-latitude temperate zone. That north-south span of nearly 1,000 km drives a clear UV gradient: solar elevation at noon is markedly higher over Marseille and the Gulf of Lion than over Brittany or the North Sea coast, so summer sunburn-producing radiation in the south consistently exceeds that of the northern plains under comparable cloud cover.

A distinctive French feature is the altitude regime of the French Alps, which top out at Mont Blanc (4,808 m). The WHO and WMO note that the UV index rises with elevation and is further amplified by snow and ice reflectivity, and Mont Blanc carries a permanent ice cap with summit temperatures near −20 °C. Combined with the thinner overhead atmosphere on the Chamonix side, this makes high-altitude UV exposure on French Alpine glaciers and ski terrain substantially stronger than at sea-level cities at the same latitude.

France sits at #168 of 191 in the WHO's global ambient-UV ranking with about 1,907 J/m² of average daily UV, around the 12th percentile worldwide.