Massy, France experiences a temperate climate with distinct seasonal variations. Winters are cool and occasionally cold, with temperatures often below freezing in January and February, but averaging around 4-6°C. As spring arrives, temperatures gradually rise, reaching an average of 7-12°C by April and May, with mild days becoming more common. Summer is warm to hot, with July and August being the warmest months, averaging around 19°C. In autumn, temperatures drop again, returning to cooler averages in September and October before a gradual decline into winter.