Pontoise, France experiences a temperate climate with distinct seasonal variations. Winters are cool and occasionally chilly, with temperatures often below freezing in January and February, but mild days can reach up to 19°C in February. Spring is characterized by gradual warming, with March and April temperatures rising steadily towards the mid-teens to low twenties. Summers are warm and pleasant, with June and July temperatures averaging around 18°C, while September and October experience a gentle decline back into autumnal conditions. Autumn brings mild days and cooler nights, with November and December temperatures fluctuating between frosty mornings and mild afternoons.