Winters in Le Blanc-Mesnil are cool and unpredictable, with temperatures often fluctuating between just above freezing and below zero. As the seasons transition into spring, temperatures gradually warm up, with March and April seeing a noticeable increase in average temperature, reaching highs of around 25°C. Summer months bring pleasant temperatures, with July and August averaging around 19°C, while September sees a slight decrease. Autumn is generally mild, with October temperatures ranging from near-freezing to just below 23°C. In contrast, winter months are consistently chilly, with little variation in average temperature throughout the season.