SeasonMapNapa vs San Francisco: which is better, month by month
San Francisco beats Napa in 6 of 12 months — its lead peaks in September (96 vs 88) — while Napa wins April to May; they are within 3 points in the other 4 months.
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.
Napa vs San Francisco — all 12 months
| Month | Napa | San Francisco | Winner | Gap |
|---|---|---|---|---|
| January | 64Ccool, soaked, clean air | 68Ccool, rainy, clean air | San Francisco | 4 |
| February | 73Bcool, rainy, clean air | 75Bcool, rainy, muggy air | Tie | 2 |
| March | 77Bnice, rainy, clean air | 76Bcool, rainy, clean air | Tie | 1 |
| April | 93Snice, dry, clean air | 85Anice, a little rain, clean air | Napa | 8 |
| May | 95Swarm, dry, clean air | 88Anice, dry, clean air | Napa | 7 |
| June | 91Swarm, dry, clean air | 92Snice, dry, clean air | Tie | 1 |
| July | 92Shot, dry, clean air | 93Snice, dry, clean air | Tie | 1 |
| August | 90Shot, dry, clean air | 95Snice, dry, clean air | San Francisco | 5 |
| September | 88Ahot, dry, clean air | 96Snice, dry, clean air | San Francisco | 8 |
| October | 86Awarm, a little rain, clean air | 90Snice, dry, clean air | San Francisco | 4 |
| November | 76Bnice, a little rain, clean air | 80Anice, a little rain, clean air | San Francisco | 4 |
| December | 63Ccool, rainy, clean air | 67Ccool, rainy, clean air | San Francisco | 4 |
A month is a tie when the two are within 3 points. The widest gap is April (93 vs 85). Tap a month for that month's temperature, rain, humidity and air quality side by side.