International audienceGrapevines are grown in Brittany and the number of winegrowing projects is rapidly increasing. In order to contribute to the development of knowledge on environmental and particularly climatic conditions for viticulture in this region, some bioclimatic indices (Huglin, GFV and GSR) were calculated using temperature data from weather stations located in proximity of grapevine plots to the north and west of Brittany as well as the climate change projections from the CNRM model (RCP4.5 and RCP8.5). Results showed that the observed temperature increase improves the current thermal conditions of the region for grape ripening and projections indicate a theoretical increase in the sugar level of future berries.La vigne est pr...