SeasonMapKaruizawa 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 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.