Winters in Rovaniemi are harsh and long, with temperatures often dropping below -30°C in January and February. Spring arrives slowly, with March temperatures fluctuating between freezing cold and mild, eventually warming up to average highs around 9°C by the end of the month. Summers are pleasant, with June and July averaging highs above 20°C, while August experiences a slight cooling trend. Autumn brings a return to chilly temperatures, with September's average high dropping back down to around 6°C, preceding a cold winter.