Winter months, typically January and February, are quite chilly with temperatures averaging around 4-6°C. As spring arrives in March, the temperatures start rising, with some warm days reaching up to 25°C. The summer season, spanning from June to August, brings warmer weather, with July being the hottest month, but still relatively mild compared to other European cities, with averages ranging from 18-19°C. Autumn months, September and October, see a return to cooler temperatures, while November and December bring back the chill of winter. Overall, Chatou's climate is quite moderate, with minimal temperature extremes throughout the year.