Champigny-sur-Marne's winters are cold and grey, with temperatures often below freezing in January and February, but slowly warming up towards the end of winter. Spring is a gradual process, with March and April bringing mild temperatures, while May marks a significant increase in warmth, with average highs reaching 12°C. Summer months are warm to hot, with July and August being the hottest periods, although temperatures rarely exceed 30°C for an extended period. Autumn brings a return to milder conditions, but with a noticeable drop in temperature by October, marking the beginning of another chilly winter.