Winters in Neuilly-sur-Seine are cold and unpredictable, with temperatures often dropping below freezing but occasionally rising into the mid-teens. Spring brings a gradual warming trend, with temperatures steadily increasing by several degrees each month, eventually reaching comfortable highs in May. Summer is mild and pleasant, with warm days in the late 20s Celsius, but nights still cool enough to require light clothing. Autumn is similar to spring, with temperatures fluctuating wildly from one day to the next, before settling into a chilly winter pattern by December. Overall, Neuilly-sur-Seine's temperature range is moderate, with few extreme heatwaves or cold snaps throughout the year.