Hangzhou's winters are mild, with temperatures rarely dropping below freezing, and occasional warm days that rise into the mid-teens. Spring is a gradual warming period, with March marking the beginning of consistent warmth. Summer is hot and humid, with temperatures often reaching the high thirties in July and August. Autumn brings a welcome cool-down, with crisp mornings and pleasant afternoons. Frosts return in November, ushering in another mild winter.