Winters in Espoo are cold and dark, with temperatures often dropping below -20°C and averaging around -4°C to -7°C. The coldest months are January and February, with occasional warmer days reaching up to 8°C. Spring arrives slowly, with March temperatures gradually warming up to averages around 0°C, and April bringing more consistent mild days. Summer is the warmest season, with June and July experiencing highs often above 25°C and averaging around 20°C, while August sees a slight cooling trend. Autumn brings a return to cooler temperatures, with September and October experiencing occasional frosts and November marking the beginning of a colder winter cycle.