Helsinki vs Oslo: which is better, month by month

Oslo beats Helsinki in 3 of 12 months — its lead peaks in March (61 vs 52) — and they are within 3 points in May to January.

Each place is scored under the lens that suits its type. Comfort is SeasonMap's 0–100 estimate from ERA5 climate normals, not a forecast.

Helsinki

🇫🇮 Finland · mild climate

Best month: July 93/100
Months won: 0 of 12

Oslo

🇳🇴 Norway · mild climate

Best month: July 94/100
Months won: 3 of 12

Helsinki vs Oslo — all 12 months

Month	Helsinki	Oslo	Winner	Gap
January	30Ffreezing, a little rain, clean air	33Ffreezing, a little rain, clean air	Tie	3
February	38Ffreezing, a little rain, clean air	43Ffreezing, a little rain, clean air	Oslo	5
March	52Dfreezing, a little rain, clean air	61Ccold, a little rain, clean air	Oslo	9
April	70Bcold, a little rain, muggy air	76Bcold, a little rain, clean air	Oslo	6
May	81Acool, a little rain, clean air	83Anice, a little rain, clean air	Tie	2
June	90Snice, a little rain, clean air	90Snice, rainy, clean air	Tie	0
July	93Snice, a little rain, clean air	94Swarm, rainy, clean air	Tie	1
August	87Anice, rainy, clean air	86Anice, rainy, clean air	Tie	1
September	77Bcool, a little rain, clean air	74Bnice, rainy, clean air	Tie	3
October	61Ccold, a little rain, clean air	59Dcold, rainy, clean air	Tie	2
November	45Fcold, a little rain, clean air	47Fcold, a little rain, clean air	Tie	2
December	34Ffreezing, a little rain, clean air	36Ffreezing, a little rain, clean air	Tie	2

A month is a tie when the two are within 3 points. The widest gap is March (52 vs 61). Tap a month for that month's temperature, rain, humidity and air quality side by side.