Boulder vs Calgary: which is better, month by month

Boulder beats Calgary in 9 of 12 months — its lead peaks in December (67 vs 38) — while Calgary wins July to August; they are within 3 points in May.

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.

Boulder

🇺🇸 United States · mild climate

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

Calgary

🇨🇦 Canada · arid climate

Best month: August 94/100
Months won: 2 of 12

Boulder vs Calgary — all 12 months

Month	Boulder	Calgary	Winner	Gap
January	62Ccold, dry, clean air	43Ffreezing, dry, clean air	Boulder	19
February	66Ccold, a little rain, clean air	41Ffreezing, dry, clean air	Boulder	25
March	74Bcool, a little rain, clean air	55Dcold, dry, clean air	Boulder	19
April	80Acool, a little rain, reliable snow	72Bcold, dry, clean air	Boulder	8
May	83Anice, rainy, clean air	80Acool, a little rain	Tie	3
June	88Ahot, a little rain, clean air	84Anice, rainy, clean air	Boulder	4
July	84Ahot, a little rain	91Swarm, a little rain	Calgary	7
August	87Ahot, a little rain, clean air	94Swarm, a little rain	Calgary	7
September	90Swarm, a little rain, clean air	86Anice, dry, clean air	Boulder	4
October	86Anice, dry, clean air	68Ccold, dry, clean air	Boulder	18
November	73Bcool, dry, clean air	51Dcold, dry, clean air	Boulder	22
December	67Ccold, dry, clean air	38Ffreezing, dry, clean air	Boulder	29

A month is a tie when the two are within 3 points. The widest gap is December (67 vs 38). Tap a month for that month's temperature, rain, humidity and air quality side by side.