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Big Sky in December

Cold and damp, as the days hold steady.

Typical weather, averaged over 30 years

December in Big Sky is cold: highs near 29°F, lows near 9°F. Rain or snow falls on about three days a week, and daylight holds at about 8 hours 48 minutes.December in Big Sky is cold: highs near -2°C, lows near -13°C. Rain or snow falls on about three days a week, and daylight holds at about 8 hours 48 minutes.

High
29°F-2°Caverage
Low
9°F-13°Caverage
Wet days
3a week · 42% of days
Daylight
8h 48mon average

Is December a good time to visit Big Sky?

December sits outside Big Sky's best months, which run from July to August. Expect cold days and rain or snow on about three days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How December sits in the year

week by week

Temperature

Highs near 29°F in December, against 29°F to 78°F through the year.Highs near -2°C in December, against -2°C to 26°C through the year.

Chance of a wet day

42% of days in December, against 36% to 60% through the year.

Cloud cover

64% cover in December, against 30% to 65% through the year.

Daylight

8h 48m in December, against 8h 48m to 15h 35m through the year.

Week by week, lightly smoothed, with December shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. November40°4°low 16°low -9°3 wet days a weekRain on about three days a week.
  2. December29°-2°low 9°low -13°3 wet days a weekRain on about three days a week.
  3. January30°-1°low 9°low -13°3 wet days a weekRain on about three days a week.

Where Big Sky sits, in December

America/Denver
this place
typical high in December 40°F4°C95°F35°C
Sunrise, mid-December
7:57 AMsets 4:43 PM
Above the sea
2,134 mhigh country
Latitude
45.3°Nnorthern hemisphere
Nearest of ours
Moose176 km south

The land around Big Sky, shaded by its typical high in December, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in United States in December

high · low · wet days
See December on the planning mapThe whole year in Big Sky

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Big Sky. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (2,134 m) against the climate model's (2,477 m).Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (2,134 m) against the climate model's (2,477 m). Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.