The Île de Batz () is an island off Roscoff in Brittany, France. Administratively, it is a commune in the Finistère department of Brittany in north-western France. Climate Île de Batz has a oceanic climate (Köppen climate classification Cfb). The average annual temperature in Île de Batz is . The average annual rainfall is with December as the wettest month. The temperatures are highest on average in August, at around , and lowest in February, at around . The highest temperature ever recorded in Île de Batz was on 18 August 1932; the coldest temperature ever recorded was on 14 February 1929 and 18 December 1927. Population Inhabitants of Île-de-Batz are called in French Batziens or Îliens. At the census of 1999 the island had a population of 575, and in 2005 it had an estimated population of 594. Sights Jardin Georges Delaselle Lighthouse See also Communes of the Finistère department References External links Official website Cultural Heritage Official website of colonie du phare Batz Communes of Finistère Car-free zones in Europe Populated coastal places in France