Oslo experiences a humid continental climate with four distinct seasons, marked by cold, snowy winters and mild, pleasant summers.

Precipitation falls fairly evenly throughout the year, though autumn tends to be wetter, making waterproof outerwear a year-round necessity rather than a seasonal consideration.

Winter temperatures regularly drop below freezing from December through February, while summer highs hover around 20-22°C, rarely exceeding 25°C.

Coastal winds from the Oslofjord can make temperatures feel considerably colder than the thermometer suggests, particularly during spring and autumn.

Layering is essential in Oslo due to the dramatic temperature swings between sunny afternoons and cool evenings, even in midsummer.