Winters in Goussainville are cool and unpredictable, with temperatures fluctuating between freezing cold and mild. January is the coldest month, with average temperatures around 4°C, while February brings a slight warming trend. Spring arrives slowly, with March temperatures gradually rising to 7°C on average, followed by April's steady increase to 8°C. Summers are warm but not sweltering, peaking in June and July at around 18-19°C, before cooling slightly in August. Autumn is characterized by a gentle decline in temperature, from 11°C in October to chilly days in November and December, averaging around 6°C throughout the winter months.