Indiana Dunes National Park vs Mammoth Cave National Park: which is better, month by month

Mammoth Cave National Park beats Indiana Dunes National Park in 7 of 12 months — its lead peaks in January (66 vs 55) — while Indiana Dunes National Park wins May 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.

Indiana Dunes National Park

🇺🇸 United States · mild climate

Best month
May 87/100
Months won
5 of 12

Mammoth Cave National Park

🇺🇸 United States · mild climate

Best month
April 87/100
Months won
7 of 12

Indiana Dunes National Park vs Mammoth Cave National Park — all 12 months

MonthIndiana Dunes National ParkMammoth Cave National ParkWinnerGap
January55Dfreezing, a little rain, clean air66Ccold, rainy, clean airMammoth Cave National Park11
February61Cfreezing, a little rain, clean air70Bcool, soaked, clean airMammoth Cave National Park9
March70Bcold, rainy, clean air81Anice, rainy, clean airMammoth Cave National Park11
April79Bcold, rainy, clean air87Anice, rainy, clean airMammoth Cave National Park8
May87Anice, rainy, muggy air77Bwarm, rainy, clean airIndiana Dunes National Park10
June81Awarm, rainy, muggy air62Csweltering, rainyIndiana Dunes National Park19
July73Bhot, rainy, muggy air50Dsweltering, soakedIndiana Dunes National Park23
August76Bhot, rainy, muggy air59Dsweltering, rainyIndiana Dunes National Park17
September84Awarm, a little rain, clean air75Bhot, rainy, clean airIndiana Dunes National Park9
October80Acool, rainy, clean air85Awarm, rainy, clean airMammoth Cave National Park5
November72Bcold, a little rain, clean air82Acool, rainy, clean airMammoth Cave National Park10
December63Cfreezing, a little rain, clean air70Bcold, rainy, clean airMammoth Cave National Park7

A month is a tie when the two are within 3 points. The widest gap is July (73 vs 50). Tap a month for that month's temperature, rain, humidity and air quality side by side.