Hiroshima vs Nagano: which is better, month by month

Hiroshima beats Nagano in 6 of 12 months — its lead peaks in January (67 vs 47) — while Nagano wins June, August and September; they are within 3 points in April, May and July.

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.

Hiroshima

🇯🇵 Japan · mild climate

Best month: October 87/100
Months won: 6 of 12

Nagano

🇯🇵 Japan · mild climate

Best month: May 86/100
Months won: 3 of 12

Hiroshima vs Nagano — all 12 months

Month	Hiroshima	Nagano	Winner	Gap
January	67Ccold, a little rain, clean air	47Fcold, rainy, clean air	Hiroshima	20
February	70Bcold, a little rain, clean air	55Dcold, rainy, clean air	Hiroshima	15
March	74Bcool, rainy	66Ccold, rainy, muggy air	Hiroshima	8
April	81Anice, rainy	78Bnice, rainy, muggy air	Tie	3
May	86Awarm, rainy, muggy air	86Awarm, rainy, clean air	Tie	0
June	68Chot, soaked, muggy air	79Bhot, soaked, muggy air	Nagano	11
July	53Dsweltering, soaked, clean air	56Dsweltering, soaked, clean air	Tie	3
August	56Dsweltering, soaked, clean air	60Csweltering, soaked, clean air	Nagano	4
September	63Chot, soaked, clean air	71Bhot, soaked, clean air	Nagano	8
October	87Awarm, rainy, clean air	75Bnice, soaked, clean air	Hiroshima	12
November	83Anice, a little rain, clean air	70Bcool, rainy, clean air	Hiroshima	13
December	71Bcold, a little rain, clean air	53Dcold, soaked, clean air	Hiroshima	18

A month is a tie when the two are within 3 points. The widest gap is January (67 vs 47). Tap a month for that month's temperature, rain, humidity and air quality side by side.