Winters in Argenteuil are cool and variable, with temperatures often below freezing but occasionally rising into the mid-teens. Spring arrives slowly, with temperatures gradually warming over several months before reaching a pleasant average high of around 18°C by June. Summer is mild, with temperatures rarely exceeding 30°C, while autumn sees a return to cooler conditions, with temperatures dipping back down towards averages seen in winter. In general, the temperature range narrows slightly as summer wears off and autumn gives way to winter again, but overall the climate remains relatively moderate throughout the year.