Mariehamn vs Oslo: which is better, month by month

Oslo beats Mariehamn in 11 of 12 months — its lead peaks in April (76 vs 63) — and they are within 3 points in September.

Each place is scored under the lens that suits its type — they are different kinds of destination, so the scores are each place at its own best. Comfort is SeasonMap's 0–100 estimate from ERA5 climate normals, not a forecast.

Mariehamn

Åland Islands · mild climate

Best month: July 87/100
Months won: 0 of 12

Oslo

🇳🇴 Norway · mild climate

Best month: July 94/100
Months won: 11 of 12

Mariehamn vs Oslo — all 12 months

Month	Mariehamn	Oslo	Winner	Gap
January	27Ffreezing, a little rain, clean air	33Ffreezing, a little rain, clean air	Oslo	6
February	37Ffreezing, a little rain, clean air	43Ffreezing, a little rain, clean air	Oslo	6
March	51Dfreezing, a little rain, clean air	61Ccold, a little rain, clean air	Oslo	10
April	63Ccold, a little rain, clean air	76Bcold, a little rain, clean air	Oslo	13
May	76Bcool, dry, clean air	83Anice, a little rain, clean air	Oslo	7
June	82Anice, a little rain, clean air	90Snice, rainy, clean air	Oslo	8
July	87Anice, a little rain, clean air	94Swarm, rainy, clean air	Oslo	7
August	80Anice, a little rain, clean air	86Anice, rainy, clean air	Oslo	6
September	73Bcool, a little rain, clean air	74Bnice, rainy, clean air	Tie	1
October	49Fcold, rainy, clean air	59Dcold, rainy, clean air	Oslo	10
November	34Fcold, a little rain, clean air	47Fcold, a little rain, clean air	Oslo	13
December	24Ffreezing, a little rain, clean air	36Ffreezing, a little rain, clean air	Oslo	12

A month is a tie when the two are within 3 points. The widest gap is April (63 vs 76). Tap a month for that month's temperature, rain, humidity and air quality side by side.