The climate is oceanic. The mean annual temperature is 11.4°C, with a minimum of 6.1°C in January and a maximum of 17.6°C in July. The mean annual precipitations are 1146 mm and vary between 900 and more than 1400 mm. Rainy season are autumn and winter. Mean annual potential evapotranspiration (Penman) is 616 mm. The mean annual drainage varies among the catchments and depending on the year between 200 and 600 mm.