Karuizawa vs Osaka: which is better, month by month

Osaka beats Karuizawa in 7 of 12 months — its lead peaks in January (69 vs 51) — while Karuizawa wins June to September; they are within 3 points in May.

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: 4 of 12

Osaka

🇯🇵 Japan · mild climate

Best month: November 84/100
Months won: 7 of 12

Karuizawa vs Osaka — all 12 months

Month	Karuizawa	Osaka	Winner	Gap
January	51Dfreezing, a little rain, clean air	69Ccold, a little rain	Osaka	18
February	54Dfreezing, a little rain, clean air	71Bcold, a little rain	Osaka	17
March	63Ccold, rainy, reliable snow	75Bcool, rainy	Osaka	12
April	73Bcool, rainy	83Anice, rainy	Osaka	10
May	79Bnice, rainy, muggy air	82Awarm, soaked	Tie	3
June	77Bnice, soaked, muggy air	66Chot, soaked, muggy air	Karuizawa	11
July	71Bhot, soaked, clean air	51Dsweltering, soaked, muggy air	Karuizawa	20
August	75Bhot, soaked, clean air	53Dsweltering, soaked, muggy air	Karuizawa	22
September	78Bnice, soaked, clean air	61Csweltering, soaked, muggy air	Karuizawa	17
October	66Ccool, soaked, clean air	80Awarm, soaked, muggy air	Osaka	14
November	69Ccold, a little rain, clean air	84Anice, a little rain, muggy air	Osaka	15
December	58Dcold, a little rain, clean air	73Bcool, a little rain, muggy air	Osaka	15

A month is a tie when the two are within 3 points. The widest gap is August (75 vs 53). Tap a month for that month's temperature, rain, humidity and air quality side by side.