SeasonMapHiroshima vs Karuizawa: which is better, month by month
Hiroshima beats Karuizawa in 8 of 12 months — its lead peaks in October (87 vs 66) — while Karuizawa wins June to September.
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 vs Karuizawa — all 12 months
| Month | Hiroshima | Karuizawa | Winner | Gap |
|---|---|---|---|---|
| January | 67Ccold, a little rain, clean air | 51Dfreezing, a little rain, clean air | Hiroshima | 16 |
| February | 70Bcold, a little rain, clean air | 54Dfreezing, a little rain, clean air | Hiroshima | 16 |
| March | 74Bcool, rainy | 63Ccold, rainy, reliable snow | Hiroshima | 11 |
| April | 81Anice, rainy | 73Bcool, rainy | Hiroshima | 8 |
| May | 86Awarm, rainy, muggy air | 79Bnice, rainy, muggy air | Hiroshima | 7 |
| June | 68Chot, soaked, muggy air | 77Bnice, soaked, muggy air | Karuizawa | 9 |
| July | 53Dsweltering, soaked, clean air | 71Bhot, soaked, clean air | Karuizawa | 18 |
| August | 56Dsweltering, soaked, clean air | 75Bhot, soaked, clean air | Karuizawa | 19 |
| September | 63Chot, soaked, clean air | 78Bnice, soaked, clean air | Karuizawa | 15 |
| October | 87Awarm, rainy, clean air | 66Ccool, soaked, clean air | Hiroshima | 21 |
| November | 83Anice, a little rain, clean air | 69Ccold, a little rain, clean air | Hiroshima | 14 |
| December | 71Bcold, a little rain, clean air | 58Dcold, a little rain, clean air | Hiroshima | 13 |
A month is a tie when the two are within 3 points. The widest gap is October (87 vs 66). Tap a month for that month's temperature, rain, humidity and air quality side by side.