Hamar's winters are long and cold, with temperatures often dropping below -20°C in January and February. Spring arrives slowly around March, with temperatures gradually warming up to around 16°C by the end of the month. Summer is mild, with July being the warmest month, averaging 18°C. Autumn brings a return to cooler temperatures, with October and November seeing temperatures drop back down into single digits. The coldest months are January and December, while the warmest months are June and July.