Great Falls Weather in December
Average highs run from 59°F on December 1 to 53°F on December 31, and lows from 35°F to 32°F. Normal precipitation for the month is 4.14 in over about 11 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
- 55°F
- Average low
- 34°F
- Precipitation
- 4.14 in
- Record high
- 81°FDec 20, 1931
- Record low
- 2°FDec 13, 1962
- Chance of a freeze
- 99%
- Daylight
- 10 h 01 min to 9 h 53 min
- Cloud cover
- 55%
- Humidity
- 81%
- Dew point
- 38°F
- Wind
- 4.3 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 | 59°F | 35°F | 76°F 1991 | 14°F 1929 | 31% | 0% |
| Dec 2 | 58°F | 35°F | 75°F 1970 | 17°F 1924 | 32% | 0% |
| Dec 3 | 58°F | 35°F | 76°F 1998 | 17°F 1935 | 32% | 0% |
| Dec 4 | 58°F | 35°F | 78°F 2021 | 17°F 2000 | 32% | 0% |
| Dec 5 | 58°F | 35°F | 76°F 1998 | 18°F 1907 | 32% | 0% |
| Dec 6 | 57°F | 35°F | 78°F 1956 | 21°F 1905 | 32% | 0% |
| Dec 7 | 57°F | 35°F | 78°F 1998 | 12°F 1937 | 33% | 0% |
| Dec 8 | 57°F | 35°F | 78°F 1922 | 17°F 2010 | 33% | 0% |
| Dec 9 | 57°F | 34°F | 78°F 1943 | 17°F 1917 | 33% | 0% |
| Dec 10 | 56°F | 34°F | 80°F 2007 | 14°F 1917 | 33% | 0% |
| Dec 11 | 56°F | 34°F | 79°F 2007 | 15°F 1917 | 33% | 0% |
| Dec 12 | 56°F | 34°F | 79°F 2007 | 9°F 1962 | 33% | 0% |
| Dec 13 | 56°F | 34°F | 76°F 1927 | 2°F 1962 | 34% | 0% |
| Dec 14 | 56°F | 34°F | 76°F 1927 | 10°F 1962 | 34% | 0% |
| Dec 15 | 55°F | 34°F | 75°F 1929 | 15°F 1901 | 34% | 0% |
| Dec 16 | 55°F | 34°F | 76°F 1971 | 12°F 1943 | 34% | 0% |
| Dec 17 | 55°F | 33°F | 74°F 1956 | 11°F 1943 | 34% | 0% |
| Dec 18 | 55°F | 33°F | 77°F 1924 | 11°F 1953 | 34% | 0% |
| Dec 19 | 55°F | 33°F | 76°F 1984 | 13°F 1975 | 34% | 0% |
| Dec 20 | 55°F | 33°F | 81°F 1931 | 11°F 1901 | 34% | 0% |
| Dec 21 | 54°F | 33°F | 73°F 1931 | 10°F 1935 | 34% | 0% |
| Dec 22 | 54°F | 33°F | 72°F 1926 | 10°F 1960 | 35% | 0% |
| Dec 23 | 54°F | 33°F | 74°F 1970 | 8°F 1989 | 35% | 0% |
| Dec 24 | 54°F | 33°F | 73°F 2015 | 8°F 2022 | 35% | 0% |
| Dec 25 | 54°F | 32°F | 78°F 1955 | 3°F 1983 | 35% | 0% |
| Dec 26 | 54°F | 32°F | 78°F 2025 | 4°F 1983 | 35% | 0% |
| Dec 27 | 54°F | 32°F | 76°F 2021 | 11°F 1935 | 35% | 0% |
| Dec 28 | 53°F | 32°F | 76°F 2025 | 7°F 1925 | 35% | 0% |
| Dec 29 | 53°F | 32°F | 74°F 1984 | 11°F 1925 | 35% | 0% |
| Dec 30 | 53°F | 32°F | 74°F 1984 | 3°F 1917 | 35% | 0% |
| Dec 31 | 53°F | 32°F | 71°F 1923 | 9°F 1935 | 35% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EST).
- December 1
- sunrise 7:12 AM, sunset 5:13 PM
- December 31
- sunrise 7:30 AM, sunset 5:23 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00389327 (Winnsboro), public domain. Records: NOAA GHCN-Daily, station USC00389350, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.