SeasonMapPhiladelphia vs Seattle: which is better, month by month
Philadelphia beats Seattle in 5 of 12 months — its lead peaks in November (71 vs 57) — while Seattle wins June to September; they are within 3 points in January to March.
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.
Philadelphia vs Seattle — all 12 months
| Month | Philadelphia | Seattle | Winner | Gap |
|---|---|---|---|---|
| January | 53Dcold, rainy, clean air | 52Dcold, rainy, clean air | Tie | 1 |
| February | 60Ccold, rainy | 58Dcold, rainy, clean air | Tie | 2 |
| March | 69Ccool, rainy, clean air | 67Ccold, a little rain, clean air | Tie | 2 |
| April | 82Anice, rainy, clean air | 77Bcool, a little rain, clean air | Philadelphia | 5 |
| May | 91Swarm, rainy | 85Anice, a little rain, clean air | Philadelphia | 6 |
| June | 79Bhot, rainy | 92Snice, dry, clean air | Seattle | 13 |
| July | 65Csweltering, rainy | 97Swarm, dry, clean air | Seattle | 32 |
| August | 72Bhot, rainy | 95Swarm, dry, clean air | Seattle | 23 |
| September | 81Awarm, rainy, clean air | 89Anice, a little rain, clean air | Seattle | 8 |
| October | 85Anice, a little rain, clean air | 72Bcool, a little rain, clean air | Philadelphia | 13 |
| November | 71Bcool, a little rain, clean air | 57Dcold, rainy, clean air | Philadelphia | 14 |
| December | 56Dcold, rainy, clean air | 49Fcold, rainy, clean air | Philadelphia | 7 |
A month is a tie when the two are within 3 points. The widest gap is July (65 vs 97). Tap a month for that month's temperature, rain, humidity and air quality side by side.