Alta vs Sun Valley: which is better, month by month

Alta beats Sun Valley in 7 of 12 months — its lead peaks in May (64 vs 34) — while Sun Valley wins February; they are within 3 points in the other 4 months.

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.

Alta

🇺🇸 United States · continental climate

Best month: March 94/100
Months won: 7 of 12

Sun Valley

🇺🇸 United States · continental climate

Best month: February 91/100
Months won: 1 of 12

Alta vs Sun Valley — all 12 months

Month	Alta	Sun Valley	Winner	Gap
January	89Afreezing, rainy, clean air	86Afreezing, a little rain, clean air	Tie	3
February	86Afreezing, rainy, reliable snow	91Sfreezing, a little rain, clean air	Sun Valley	5
March	94Sfreezing, rainy, reliable snow	83Acold, a little rain, muggy air	Alta	11
April	79Bcold, rainy, reliable snow	58Dcold, a little rain, reliable snow	Alta	21
May	64Ccold, rainy, reliable snow	34Fcool, a little rain, reliable snow	Alta	30
June	26Fnice, a little rain	20Fnice, dry, clean air	Alta	6
July	14Fnice, rainy	12Fwarm, dry, clean air	Tie	2
August	12Fnice, rainy, clean air	14Fwarm, dry, clean air	Tie	2
September	22Fnice, rainy, clean air	18Fnice, dry, clean air	Alta	4
October	69Ccold, a little rain, clean air	45Fcold, a little rain, clean air	Alta	24
November	82Acold, a little rain, clean air	72Bcold, a little rain, clean air	Alta	10
December	91Sfreezing, rainy, clean air	88Afreezing, a little rain, clean air	Tie	3

A month is a tie when the two are within 3 points. The widest gap is May (64 vs 34). Tap a month for that month's temperature, rain, humidity and air quality side by side.