Indiana Dunes National Park vs St. Louis: which is better, month by month

Indiana Dunes National Park beats St. Louis in 5 of 12 months — its lead peaks in July (73 vs 66) — while St. Louis wins October; they are within 3 points in the other 6 months.

Each place is scored under the lens that suits its type — they are different kinds of destination, so the scores are each place at its own best. Comfort is SeasonMap's 0–100 estimate from ERA5 climate normals, not a forecast.

Indiana Dunes National Park

🇺🇸 United States · mild climate

Best month: May 87/100
Months won: 5 of 12

St. Louis

🇺🇸 United States · mild climate

Best month: May 87/100
Months won: 1 of 12

Indiana Dunes National Park vs St. Louis — all 12 months

Month	Indiana Dunes National Park	St. Louis	Winner	Gap
January	55Dfreezing, a little rain, clean air	50Dcold, a little rain, clean air	Indiana Dunes National Park	5
February	61Cfreezing, a little rain, clean air	62Ccold, a little rain, clean air	Tie	1
March	70Bcold, rainy, clean air	69Ccool, rainy, clean air	Tie	1
April	79Bcold, rainy, clean air	80Anice, rainy, clean air	Tie	1
May	87Anice, rainy, muggy air	87Awarm, rainy	Tie	0
June	81Awarm, rainy, muggy air	76Bsweltering, rainy	Indiana Dunes National Park	5
July	73Bhot, rainy, muggy air	66Csweltering, rainy	Indiana Dunes National Park	7
August	76Bhot, rainy, muggy air	73Bsweltering, rainy	Tie	3
September	84Awarm, a little rain, clean air	85Ahot, rainy, clean air	Tie	1
October	80Acool, rainy, clean air	84Anice, a little rain, clean air	St. Louis	4
November	72Bcold, a little rain, clean air	68Ccool, a little rain, clean air	Indiana Dunes National Park	4
December	63Cfreezing, a little rain, clean air	59Dcold, a little rain, clean air	Indiana Dunes National Park	4

A month is a tie when the two are within 3 points. The widest gap is July (73 vs 66). Tap a month for that month's temperature, rain, humidity and air quality side by side.