Boston vs Philadelphia: which is better, month by month

Philadelphia beats Boston in 8 of 12 months — its lead peaks in January (53 vs 41) — while Boston 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.

Boston

🇺🇸 United States · mild climate

Best month: September 90/100
Months won: 4 of 12

Philadelphia

🇺🇸 United States · mild climate

Best month: May 91/100
Months won: 8 of 12

Boston vs Philadelphia — all 12 months

Month	Boston	Philadelphia	Winner	Gap
January	41Ffreezing, rainy, clean air	53Dcold, rainy, clean air	Philadelphia	12
February	51Dcold, a little rain, clean air	60Ccold, rainy	Philadelphia	9
March	59Dcold, rainy, clean air	69Ccool, rainy, clean air	Philadelphia	10
April	70Bcool, rainy, clean air	82Anice, rainy, clean air	Philadelphia	12
May	86Anice, a little rain, clean air	91Swarm, rainy	Philadelphia	5
June	89Awarm, a little rain	79Bhot, rainy	Boston	10
July	76Bhot, rainy	65Csweltering, rainy	Boston	11
August	80Ahot, rainy	72Bhot, rainy	Boston	8
September	90Swarm, rainy, clean air	81Awarm, rainy, clean air	Boston	9
October	74Bnice, rainy, clean air	85Anice, a little rain, clean air	Philadelphia	11
November	63Ccold, rainy, clean air	71Bcool, a little rain, clean air	Philadelphia	8
December	46Fcold, rainy, clean air	56Dcold, rainy, clean air	Philadelphia	10

A month is a tie when the two are within 3 points. The widest gap is January (41 vs 53). Tap a month for that month's temperature, rain, humidity and air quality side by side.