SeasonMapChicago vs San Francisco: which is better, month by month
San Francisco beats Chicago in all 12 months — its lead peaks in January (68 vs 40).
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.
Chicago vs San Francisco — all 12 months
| Month | Chicago | San Francisco | Winner | Gap |
|---|---|---|---|---|
| January | 40Ffreezing, a little rain, clean air | 68Ccool, rainy, clean air | San Francisco | 28 |
| February | 49Ffreezing, a little rain, clean air | 75Bcool, rainy, muggy air | San Francisco | 26 |
| March | 64Ccold, a little rain, clean air | 76Bcool, rainy, clean air | San Francisco | 12 |
| April | 71Bcool, rainy, clean air | 85Anice, a little rain, clean air | San Francisco | 14 |
| May | 83Anice, rainy, muggy air | 88Anice, dry, clean air | San Francisco | 5 |
| June | 86Awarm, rainy | 92Snice, dry, clean air | San Francisco | 6 |
| July | 76Bhot, rainy, muggy air | 93Snice, dry, clean air | San Francisco | 17 |
| August | 81Ahot, a little rain | 95Snice, dry, clean air | San Francisco | 14 |
| September | 91Swarm, a little rain, clean air | 96Snice, dry, clean air | San Francisco | 5 |
| October | 73Bnice, rainy, clean air | 90Snice, dry, clean air | San Francisco | 17 |
| November | 62Ccold, a little rain, clean air | 80Anice, a little rain, clean air | San Francisco | 18 |
| December | 46Fcold, a little rain, 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 (40 vs 68). Tap a month for that month's temperature, rain, humidity and air quality side by side.