The average temperature in Rennes the average temperature is 30.99 degrees in summer, with precipitation around 3.0 mm , Chambery's temperatures reach 32.77 during the hot season, with 3.0 average of rain rate . In winter, however, weather indicators show around -7.1 degrees in Chambery, compared to the -2.77 average degrees reported in Rennes. During the winter period, Rennes can register 6.0 mm precipitation, while Chambery have an average of 6.0 mm rain level.