SeasonMapChicago vs St. Louis: which is better, month by month
St. Louis beats Chicago in 8 of 12 months — its lead peaks in February (62 vs 49) — while Chicago 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.
Chicago vs St. Louis — all 12 months
| Month | Chicago | St. Louis | Winner | Gap |
|---|---|---|---|---|
| January | 40Ffreezing, a little rain, clean air | 50Dcold, a little rain, clean air | St. Louis | 10 |
| February | 49Ffreezing, a little rain, clean air | 62Ccold, a little rain, clean air | St. Louis | 13 |
| March | 64Ccold, a little rain, clean air | 69Ccool, rainy, clean air | St. Louis | 5 |
| April | 71Bcool, rainy, clean air | 80Anice, rainy, clean air | St. Louis | 9 |
| May | 83Anice, rainy, muggy air | 87Awarm, rainy | St. Louis | 4 |
| June | 86Awarm, rainy | 76Bsweltering, rainy | Chicago | 10 |
| July | 76Bhot, rainy, muggy air | 66Csweltering, rainy | Chicago | 10 |
| August | 81Ahot, a little rain | 73Bsweltering, rainy | Chicago | 8 |
| September | 91Swarm, a little rain, clean air | 85Ahot, rainy, clean air | Chicago | 6 |
| October | 73Bnice, rainy, clean air | 84Anice, a little rain, clean air | St. Louis | 11 |
| November | 62Ccold, a little rain, clean air | 68Ccool, a little rain, clean air | St. Louis | 6 |
| December | 46Fcold, a little rain, clean air | 59Dcold, a little rain, clean air | St. Louis | 13 |
A month is a tie when the two are within 3 points. The widest gap is February (49 vs 62). Tap a month for that month's temperature, rain, humidity and air quality side by side.