Kajaani's winters are harsh, with temperatures often plummeting below -30°C and averaging around -10°C. Spring arrives gradually, with temperatures slowly rising towards the mid-20s by May, but still experiencing occasional cold snaps. Summer is mild and pleasant, with highs sometimes reaching over 30°C in June and July, while autumn brings a return to chillier temperatures, often dipping below freezing by October. The coldest months are January and December, while the warmest month is usually July.