Karuizawa vs Sapporo: which is better, month by month

Karuizawa beats Sapporo in 6 of 12 months — its lead peaks in December (58 vs 42) — while Sapporo wins May, June, July, September and October; they are within 3 points in April.

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.

Karuizawa

🇯🇵 Japan · mild climate

Best month: May 79/100
Months won: 6 of 12

Sapporo

🇯🇵 Japan · continental climate

Best month: June 89/100
Months won: 5 of 12

Karuizawa vs Sapporo — all 12 months

Month	Karuizawa	Sapporo	Winner	Gap
January	51Dfreezing, a little rain, clean air	40Ffreezing, a little rain, clean air	Karuizawa	11
February	54Dfreezing, a little rain, clean air	45Ffreezing, a little rain, clean air	Karuizawa	9
March	63Ccold, rainy, reliable snow	57Dcold, a little rain, muggy air	Karuizawa	6
April	73Bcool, rainy	74Bcool, rainy, muggy air	Tie	1
May	79Bnice, rainy, muggy air	84Anice, rainy, clean air	Sapporo	5
June	77Bnice, soaked, muggy air	89Anice, rainy, clean air	Sapporo	12
July	71Bhot, soaked, clean air	79Bhot, rainy, clean air	Sapporo	8
August	75Bhot, soaked, clean air	67Chot, soaked, clean air	Karuizawa	8
September	78Bnice, soaked, clean air	86Awarm, rainy, clean air	Sapporo	8
October	66Ccool, soaked, clean air	73Bcool, rainy, clean air	Sapporo	7
November	69Ccold, a little rain, clean air	59Dcold, rainy, clean air	Karuizawa	10
December	58Dcold, a little rain, clean air	42Ffreezing, a little rain, clean air	Karuizawa	16

A month is a tie when the two are within 3 points. The widest gap is December (58 vs 42). Tap a month for that month's temperature, rain, humidity and air quality side by side.