Chicago 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

🇺🇸 United States · mild climate

Best month: September 91/100
Months won: 4 of 12

St. Louis

🇺🇸 United States · mild climate

Best month: May 87/100
Months won: 8 of 12

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.