Mikkeli's winters are harsh, with temperatures often below freezing and dipping as low as -31°C in February. Spring arrives slowly, with temperatures gradually warming up by April, but still experiencing occasional cold snaps. Summer brings mild temperatures, with highs rarely exceeding 33°C, while autumn is similarly cool, with temperatures dropping back down to around 0°C by November. The lowest temperature of the year typically occurs in January and December, while July and August are usually the warmest months, though not excessively so.