SeasonMapBig Sky weather in December
United States
December in Big Sky: freezing, a little rain, with clean air — fine if you can take well below freezing.
#3 of 12 months in Big Sky · #194 of 1383 destinations to visit in December · comfort 87/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Big Sky in December
Other months in Big Sky
Big Sky's forum calls February prime powder season — deep base depth, frequent storms, and, outside the Presidents Day weekend crush, thinner crowds than the holidays. Regulars say conditions generally hold up well into March, so it's not a narrow window.
Add your own note from Big Sky's card on the map.
Big Sky climate normals — December
| Daytime high | -1°C / 29°F | 🥶 freezing |
|---|---|---|
| Nighttime low | -10°C / 13°F | |
| Feels like (high) | -6°C / 21°F | |
| Rainfall | 49 mm / 1.9 in | 🌦 some rain |
| Rainy days | 12 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | -9°C / 15°F | |
| Sunshine | 5.8 h/day | |
| Daylight | 8.8 h | |
| Wind | 12 km/h / 7 mph | |
| Snowfall | 50.9 cm / 20 in | |
| Air quality (US AQI) | 41 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Big Sky 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 Big Sky'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 weatherBig Sky's weather peaks December–February.
Best weatherFair weatherToughest weather
What's on in Big Sky in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Ski season
25 Nov – 25 Apr · usuallyBook earlyLifts usually turn from the week of American Thanksgiving to late April, with the Lone Peak tram the reason people come. February and the holiday weeks are the expensive ones; early December is the same mountain for half the money.
- Season
Snow season
Ski seasonAbout 51 cm of snow falls in the month.
from the climate normals
Nearby, and something's on
Within 300 km of Big Sky — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Big Sky?
Big Sky in December — FAQ
- Is December a good time to visit Big Sky?
- December in Big Sky: freezing, a little rain, with clean air — fine if you can take well below freezing. It ranks #3 of 12 months for Big Sky on SeasonMap's comfort score (87/100).
- What is the weather like in Big Sky in December?
- In December, Big Sky averages a daily high of -1.4°C and a low of -10.3°C, with about 49.1 mm of rain over roughly 12.2 rainy days.
- What is the air quality in Big Sky in December?
- Big Sky has a mean US Air Quality Index of about 41 in December.
- Does it snow in Big Sky in December?
- Big Sky sees roughly 50.9 cm of snowfall in December.
Other months in Big Sky
Compare Big Sky in December
Warmer or cooler than Big Sky in December
Similar destinations in North America — December
Within 300 km: Yellowstone National Park's Winter wolves in the Lamar around 20 Dec – 10 Mar, and Grand Teton National Park's Elk on the National Elk Refuge around 1 Dec – 31 Mar.