Winters in Vanves are chilly and unpredictable, with temperatures often dropping below freezing point but occasionally rising to mild highs. Spring brings gradual warming, with temperatures steadily increasing into the mid-teens by April and May. Summers are warm to hot, with July being the warmest month on average, while August can be slightly cooler due to its proximity to summer's end. Autumn is generally cool, with temperatures fluctuating between chilly mornings and mild afternoons, slowly decreasing as winter approaches again.