SeasonMapBoston vs San Francisco: which is better, month by month
San Francisco beats Boston in 10 of 12 months — its lead peaks in January (68 vs 41) — and they are within 3 points in May to June.
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.
Boston vs San Francisco — all 12 months
| Month | Boston | San Francisco | Winner | Gap |
|---|---|---|---|---|
| January | 41Ffreezing, rainy, clean air | 68Ccool, rainy, clean air | San Francisco | 27 |
| February | 51Dcold, a little rain, clean air | 75Bcool, rainy, muggy air | San Francisco | 24 |
| March | 59Dcold, rainy, clean air | 76Bcool, rainy, clean air | San Francisco | 17 |
| April | 70Bcool, rainy, clean air | 85Anice, a little rain, clean air | San Francisco | 15 |
| May | 86Anice, a little rain, clean air | 88Anice, dry, clean air | Tie | 2 |
| June | 89Awarm, a little rain | 92Snice, dry, clean air | Tie | 3 |
| July | 76Bhot, rainy | 93Snice, dry, clean air | San Francisco | 17 |
| August | 80Ahot, rainy | 95Snice, dry, clean air | San Francisco | 15 |
| September | 90Swarm, rainy, clean air | 96Snice, dry, clean air | San Francisco | 6 |
| October | 74Bnice, rainy, clean air | 90Snice, dry, clean air | San Francisco | 16 |
| November | 63Ccold, rainy, clean air | 80Anice, a little rain, clean air | San Francisco | 17 |
| December | 46Fcold, rainy, clean air | 67Ccool, rainy, clean air | San Francisco | 21 |
A month is a tie when the two are within 3 points. The widest gap is January (41 vs 68). Tap a month for that month's temperature, rain, humidity and air quality side by side.