average temperature la rochelle
La Rochelle: Annual Weather Averages. July is the hottest month in La Rochelle with an average temperature of 20Â°C (68Â°F) and the coldest is January at 6Â°C (43Â°F) with the most daily sunshine hours at 13 in July.The wettest month is January with an average of 80mm of rain.a Rochelle: Annual Weather Averages. July is the hottest month in La Rochelle with an average temperature of 20Â°C (68Â°F) and the coldest is January at 6Â°C (43Â°F) with the most daily sunshine hours at 13 in July.