Big Sky Weather in December
Average highs run from 30°F on December 1 to 28°F on December 31, and lows from 11°F to 8°F. Normal precipitation for the month is 1.74 in over about 14 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 28°F
- Average low
- 9°F
- Precipitation
- 1.74 in
- Snowfall
- 7.3 in
- Record high
- 68°FDec 5, 1939
- Record low
- -35°FDec 31, 1927
- Chance of a freeze
- 100%
- Daylight
- 8 h 59 min to 8 h 48 min
- Cloud cover
- 70%
- Humidity
- 91%
- Dew point
- 14°F
- Wind
- 8.5 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Dec 1 | 30°F | 11°F | 56°F 1995 | -14°F 1985 | 42% | 14% |
| Dec 2 | 30°F | 11°F | 59°F 2021 | -12°F 1985 | 42% | 14% |
| Dec 3 | 29°F | 10°F | 62°F 2021 | -5°F 1972 | 42% | 14% |
| Dec 4 | 29°F | 10°F | 58°F 1939 | -17°F 1972 | 42% | 14% |
| Dec 5 | 29°F | 10°F | 68°F 1939 | -24°F 1972 | 42% | 14% |
| Dec 6 | 29°F | 10°F | 60°F 1939 | -21°F 1972 | 43% | 15% |
| Dec 7 | 28°F | 9°F | 58°F 1939 | -23°F 1972 | 43% | 15% |
| Dec 8 | 28°F | 9°F | 56°F 1940 | -26°F 1932 | 43% | 15% |
| Dec 9 | 28°F | 9°F | 57°F 2025 | -32°F 1919 | 43% | 15% |
| Dec 10 | 28°F | 9°F | 57°F 1933 | -32°F 1932 | 43% | 15% |
| Dec 11 | 27°F | 9°F | 57°F 2025 | -33°F 1932 | 44% | 15% |
| Dec 12 | 27°F | 8°F | 57°F 2025 | -34°F 1919 | 44% | 15% |
| Dec 13 | 27°F | 8°F | 59°F 2014 | -34°F 1919 | 44% | 15% |
| Dec 14 | 27°F | 8°F | 56°F 2025 | -23°F 1926 | 44% | 15% |
| Dec 15 | 27°F | 8°F | 61°F 2025 | -21°F 2008 | 45% | 16% |
| Dec 16 | 27°F | 8°F | 57°F 1962 | -24°F 2008 | 45% | 16% |
| Dec 17 | 27°F | 8°F | 55°F 1976 | -31°F 2016 | 45% | 16% |
| Dec 18 | 27°F | 8°F | 53°F 1979 | -21°F 2016 | 45% | 16% |
| Dec 19 | 27°F | 8°F | 54°F 2003 | -34°F 1924 | 45% | 16% |
| Dec 20 | 27°F | 8°F | 54°F 1941 | -24°F 2008 | 46% | 16% |
| Dec 21 | 27°F | 8°F | 54°F 1969 | -28°F 1990 | 46% | 16% |
| Dec 22 | 27°F | 8°F | 55°F 2024 | -31°F 2022 | 46% | 16% |
| Dec 23 | 27°F | 8°F | 53°F 1964 | -31°F 2022 | 46% | 16% |
| Dec 24 | 27°F | 8°F | 52°F 2025 | -30°F 1983 | 46% | 16% |
| Dec 25 | 27°F | 8°F | 56°F 2025 | -26°F 1983 | 46% | 16% |
| Dec 26 | 27°F | 8°F | 60°F 1980 | -17°F 1996 | 46% | 16% |
| Dec 27 | 27°F | 8°F | 54°F 1980 | -15°F 1941 | 46% | 16% |
| Dec 28 | 27°F | 8°F | 54°F 1945 | -20°F 1983 | 46% | 16% |
| Dec 29 | 27°F | 8°F | 51°F 1980 | -32°F 1978 | 46% | 16% |
| Dec 30 | 27°F | 8°F | 51°F 1980 | -28°F 1978 | 46% | 16% |
| Dec 31 | 28°F | 8°F | 54°F 1980 | -35°F 1927 | 46% | 16% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:45 AM, sunset 4:44 PM
- December 31
- sunrise 8:05 AM, sunset 4:53 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00240775 (Big Sky 2WNW), public domain. Records: NOAA GHCN-Daily, station USC00242793, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.