Boulder vs Yellowstone National Park: which is better, month by month

Boulder beats Yellowstone National Park in 9 of 12 months — its lead peaks in December (67 vs 42) — while Yellowstone National Park wins July to August; they are within 3 points in June.

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.

Boulder

🇺🇸 United States · mild climate

Best month: September 90/100
Months won: 9 of 12

Yellowstone National Park

🇺🇸 United States · continental climate

Best month: August 92/100
Months won: 2 of 12

Boulder vs Yellowstone National Park — all 12 months

Month	Boulder	Yellowstone National Park	Winner	Gap
January	62Ccold, dry, clean air	45Ffreezing, a little rain, clean air	Boulder	17
February	66Ccold, a little rain, clean air	47Ffreezing, a little rain, clean air	Boulder	19
March	74Bcool, a little rain, clean air	62Cfreezing, a little rain, muggy air	Boulder	12
April	80Acool, a little rain, reliable snow	71Bcold, a little rain, reliable snow	Boulder	9
May	83Anice, rainy, clean air	78Bcold, a little rain, reliable snow	Boulder	5
June	88Ahot, a little rain, clean air	86Acool, a little rain	Tie	2
July	84Ahot, a little rain	90Snice, dry	Yellowstone National Park	6
August	87Ahot, a little rain, clean air	92Snice, a little rain, clean air	Yellowstone National Park	5
September	90Swarm, a little rain, clean air	84Acool, a little rain, clean air	Boulder	6
October	86Anice, dry, clean air	70Bcold, a little rain, clean air	Boulder	16
November	73Bcool, dry, clean air	55Dfreezing, a little rain, clean air	Boulder	18
December	67Ccold, dry, clean air	42Ffreezing, a little rain, clean air	Boulder	25

A month is a tie when the two are within 3 points. The widest gap is December (67 vs 42). Tap a month for that month's temperature, rain, humidity and air quality side by side.