Because of its amphitheatrical situation facing the ocean, Biarritz is open to marine winds. The winters are mild and the summer heat is bearable. This privileged climatic situation has earned it the title of “hydrothermal and climatic station” since 1912. The wind regime is dominated by a triple influence: the Atlantic Ocean, the Pyrenees and a regime of local breezes. The prevailing sea winds bring moisture and freshness in summer and mildness in winter. Coming from the south, warm winds are generated by a foehn effect. Indeed, the air coming from Spain loses its moisture crossing the Pyrenees and heats up losing altitude. In winter, the city is often subject to high temperatures compared to the rest of the country. The average temperature in winter is around 8 ° C and around 20 ° C in summer.
The rains on the Basque coast are rarely persistent, except during the winter. They often manifest themselves as intense thunderstorms, which explains the high rainfall, but a number of annual rainfall days slightly lower than in some other French regions.
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