Bolzano's winters are harsh, with temperatures often plummeting below -20°C and averaging around -16°C in January. Spring brings a gradual warming, but temperatures remain quite chilly until May, when they finally rise above 0°C for good. Summer is mild, with highs rarely exceeding 10°C, while autumns are cool, with temperatures dropping back down to around -5°C by October. November and December bring the cold back, with temperatures averaging around -8°C and -11°C respectively.