Vienna's winters are cold and unpredictable, with temperatures often dropping below freezing, but occasionally rising into the mid-teens. Spring is a gradual warming process, with March marking a turning point as temperatures rise above 20°C for the first time of the year. Summer is warm to hot, with July being the hottest month, but even then temperatures rarely rise above 37°C. Autumn brings a return to cooler temperatures, with October marking a distinct drop in mercury, setting the stage for another cold winter.