Alta weather in December
December in Alta: freezing, rainy, with clean air — one of the best months to visit.
Updated September 2026 · climate normals from ERA5 reanalysis
#2 of 12 months in Alta · #51 of 1413 destinations to visit in December · comfort 91/100 (tier S)
- Days
- -2°C
- Nights
- -9°C
- Wet days
- 13
- Sun
- 6.3 h
- Humidity
- 70%
- Daylight
- 9 h

Traveller notes on Alta in December
Notes from nearby Park City (13 km away)
Alta doesn't have its own notes for December yet — these are about Park City, close enough to share the season.
Park City-forum threads on December conditions call it genuinely early-season and unpredictable - some Decembers deliver deep, reliable snow, others run lean until later in the month, and posters are candid that year-to-year variation here is real rather than a rare exception. What's dependable regardless: the resorts run extensive snowmaking on the lower runs, so skiing itself is available even in a lighter-snow year, even if natural coverage isn't yet at its deepest. The last week of December consistently gets singled out as more reliable than the first half. Road conditions get a mention too - Utah's plow crews are called efficient enough that only a major storm actually closes roads, so a mid-December trip rarely turns into a logistics problem even if the powder is thinner than a February visit. The record: a frigid 2.3C by day dropping to -7.6C at night, 104mm across 11.3 days, a notably high 58.5cm of fresh snowfall, 78 percent humidity and 6.8 hours of sun.
Other months in Alta
Alta-forum threads on a September visit describe lift-served hiking access to Albion Basin as genuinely ending right around the start of the month, posters naming a season that typically runs from late June through the first few days of September. Regulars call Cecret Lake, Red and White Pine, Catherine's Pass and Grizzly Gulch real standard trails around Alta, several posters naming these the go-to routes in Little Cottonwood Canyon. Posters call fall color genuinely starting the last week of September into early October, several regulars naming this a reason to time a trip toward the later part of the month. Regulars call September mornings genuinely cool even with warm afternoons, several threads recommending layers for early hikes. Posters recommend checking lift and parking access before planning around Albion Basin, several regulars calling this standard given how the cutoff shifts year to year. The record: 17C days, 7.8C nights, 96.7mm across 12 days and 52 percent humidity.
Alta-forum threads on a November visit describe opening day as genuinely conditions-dependent, posters naming a typical window around November eighteenth to twenty-first though timing shifts with how much snow has fallen by then. Regulars call Alta's higher elevation and heavier natural snowfall a real advantage, several posters naming this why early-season conditions here hold up better than at nearby Utah resorts. Posters call a confirmed opening date genuinely unreliable to plan around, several regulars recommending flexible travel dates for a November trip. Regulars call early-season terrain considerably more limited than full winter, several threads warning only some runs are typically open right after opening day. Posters recommend checking daily snow reports before finalizing plans, several regulars calling this standard given how much conditions shift early in the season. The record: 1.4C days, -6.3C nights, 73mm across nearly 9 days and 66 percent humidity.
Alta-forum threads on a July visit describe Albion Basin as genuinely at peak wildflower bloom, posters naming the seasonal gate opening July first as the real signal hiking there is finally possible. Regulars call the Cecret Lake trail a real standard pick, several posters naming it an easy, family-friendly way to reach the wildflower meadows. Posters call parking genuinely limited once the gate opens, several regulars recommending an early start or the shuttle to avoid a long wait at the trailhead. Regulars call July mornings comfortably cool before afternoon warmth sets in, several threads naming this the real window for a comfortable hike. Posters recommend checking bloom reports before a July trip, several regulars calling timing genuinely variable year to year depending on the past winter's runoff. The record: 22.8C days, 13.4C nights, 86.4mm across nearly 14 days and 44 percent humidity.
Alta-forum threads on an October visit describe this as genuinely off-season for skiing, posters calling the resort typically not opening lifts until around November eighteenth, conditions permitting, well after most October trips. Regulars call fall colors a real reason to visit anyway, several posters naming late September into early October a beautiful, genuinely lonely window for canyon scenery. Posters call weather risk genuinely rising as October goes on, several regulars warning an early system is possible even before the resort itself is ready to open. Regulars call this a real quiet stretch between summer hiking season and the winter rush, several threads describing October as neither one thing nor the other. Posters recommend treating an October trip as a scenery visit rather than a ski trip, several regulars calling this the honest expectation. The record: 7.7C days, -0.8C nights, an extraordinarily high 75.3mm across over 8 days and 58 percent humidity.
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Alta climate normals — December
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Alta in December
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyWinter / Christmas break in United States, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Alta's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherAlta's best weather comes in January, March and December — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in Alta in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Snow season
Ski seasonAbout 101 cm of snow falls in the month.
from the climate normals
Nearby, and something's on
Within 300 km of Alta — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Alta?
Alta in December — FAQ
- Is December a good time to visit Alta?
- December in Alta: freezing, rainy, with clean air — one of the best months to visit. It ranks #2 of 12 months for Alta on SeasonMap's comfort score (91/100).
- What is the weather like in Alta in December?
- In December, Alta averages a daily high of -2.3°C and a low of -9.5°C, with about 102.3 mm of rain over roughly 13 rainy days.
- What is the air quality in Alta in December?
- Alta has a mean US Air Quality Index of about 46 in December.
- Does it snow in Alta in December?
- Alta sees roughly 101.3 cm of snowfall in December.
Within 300 km: Salt Lake City's Temple Square lights around 27 Nov – 1 Jan, and Park City's Ski season around 20 Nov – 12 Apr.