Montfermeil experiences a mild and temperate climate, with temperatures gradually warming up as the seasons progress. Winters are chilly but not extreme, with average temperatures ranging from 4-6°C in January and December. As spring arrives in March and April, temperatures rise to around 7-8°C, with occasional warm days reaching up to 25-24°C. Summers are pleasant, with July and August averaging 19-18°C, although temperatures can soar to as high as 32°C on hot days. Autumn brings a return to milder temperatures, with September and October averaging 17-11°C, before cooling down again in November and December.