Great Falls Weather in December
Average highs run from 39°F on December 1 to 37°F on December 31, and lows from 22°F to 18°F. Normal precipitation for the month is 0.56 in over about 7 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
- 37°F
- Average low
- 20°F
- Precipitation
- 0.56 in
- Snowfall
- 9.6 in
- Record high
- 69°FDec 1, 2021
- Record low
- -43°FDec 29, 1968
- Chance of a freeze
- 100%
- Daylight
- 8 h 44 min to 8 h 31 min
- Cloud cover
- 68%
- Humidity
- 77%
- Dew point
- 18°F
- Wind
- 11.9 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 | 39°F | 22°F | 69°F 2021 | -29°F 1985 | 20% | 21% |
| Dec 2 | 38°F | 22°F | 60°F 1941 | -28°F 1985 | 20% | 21% |
| Dec 3 | 38°F | 22°F | 61°F 1987 | -19°F 1972 | 20% | 21% |
| Dec 4 | 38°F | 21°F | 62°F 1939 | -23°F 2013 | 20% | 21% |
| Dec 5 | 38°F | 21°F | 69°F 1939 | -26°F 2013 | 20% | 21% |
| Dec 6 | 37°F | 21°F | 64°F 2023 | -28°F 2013 | 20% | 21% |
| Dec 7 | 37°F | 21°F | 60°F 2024 | -33°F 2013 | 20% | 21% |
| Dec 8 | 37°F | 21°F | 63°F 2020 | -36°F 1972 | 20% | 21% |
| Dec 9 | 37°F | 21°F | 62°F 1957 | -26°F 1977 | 20% | 21% |
| Dec 10 | 37°F | 20°F | 67°F 1939 | -22°F 2000 | 20% | 22% |
| Dec 11 | 37°F | 20°F | 60°F 1939 | -21°F 2000 | 20% | 22% |
| Dec 12 | 36°F | 20°F | 63°F 2014 | -19°F 2000 | 20% | 22% |
| Dec 13 | 36°F | 20°F | 57°F 1998 | -19°F 1963 | 20% | 22% |
| Dec 14 | 36°F | 20°F | 63°F 2025 | -25°F 2008 | 20% | 22% |
| Dec 15 | 36°F | 20°F | 63°F 2025 | -28°F 1964 | 21% | 23% |
| Dec 16 | 36°F | 20°F | 63°F 1980 | -36°F 1964 | 21% | 23% |
| Dec 17 | 36°F | 20°F | 59°F 1976 | -27°F 1983 | 21% | 23% |
| Dec 18 | 36°F | 19°F | 58°F 1979 | -21°F 1990 | 21% | 23% |
| Dec 19 | 36°F | 19°F | 59°F 2004 | -25°F 1990 | 21% | 23% |
| Dec 20 | 36°F | 19°F | 59°F 2024 | -28°F 1990 | 21% | 24% |
| Dec 21 | 36°F | 19°F | 59°F 2019 | -35°F 1990 | 21% | 24% |
| Dec 22 | 36°F | 19°F | 56°F 1994 | -32°F 2022 | 21% | 24% |
| Dec 23 | 36°F | 19°F | 56°F 1960 | -30°F 1983 | 21% | 24% |
| Dec 24 | 36°F | 19°F | 58°F 1950 | -42°F 1983 | 21% | 24% |
| Dec 25 | 36°F | 19°F | 59°F 2005 | -29°F 1983 | 21% | 24% |
| Dec 26 | 36°F | 19°F | 60°F 1980 | -27°F 1996 | 21% | 24% |
| Dec 27 | 36°F | 19°F | 63°F 1980 | -24°F 2021 | 21% | 25% |
| Dec 28 | 37°F | 19°F | 58°F 1999 | -35°F 1968 | 22% | 25% |
| Dec 29 | 37°F | 18°F | 60°F 1956 | -43°F 1968 | 22% | 25% |
| Dec 30 | 37°F | 18°F | 53°F 1956 | -30°F 1968 | 22% | 25% |
| Dec 31 | 37°F | 18°F | 59°F 1963 | -26°F 2017 | 21% | 25% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:52 AM, sunset 4:36 PM
- December 31
- sunrise 8:13 AM, sunset 4:44 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00243749 (Great Falls 16ST), public domain. Records: NOAA GHCN-Daily, station USW00024143, 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.