Helena Weather in December
Average highs run from 36°F on December 1 to 31°F on December 31, and lows from 18°F to 12°F. Normal precipitation for the month is 0.46 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
- 33°F
- Average low
- 14°F
- Precipitation
- 0.46 in
- Snowfall
- 7.7 in
- Record high
- 70°FDec 1, 2021
- Record low
- -38°FDec 17, 1964
- Chance of a freeze
- 100%
- Daylight
- 8 h 50 min to 8 h 38 min
- Cloud cover
- 68%
- Humidity
- 88%
- Dew point
- 15°F
- Wind
- 7.2 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 | 36°F | 18°F | 70°F 2021 | -25°F 1985 | 21% | 15% |
| Dec 2 | 36°F | 18°F | 64°F 2021 | -25°F 1985 | 21% | 16% |
| Dec 3 | 36°F | 17°F | 62°F 1975 | -16°F 1972 | 21% | 16% |
| Dec 4 | 35°F | 17°F | 61°F 1939 | -24°F 1972 | 21% | 16% |
| Dec 5 | 35°F | 17°F | 64°F 2023 | -28°F 1972 | 21% | 16% |
| Dec 6 | 35°F | 16°F | 61°F 2023 | -30°F 1972 | 21% | 16% |
| Dec 7 | 34°F | 16°F | 58°F 2024 | -28°F 1972 | 21% | 16% |
| Dec 8 | 34°F | 16°F | 62°F 1939 | -35°F 1972 | 21% | 16% |
| Dec 9 | 34°F | 16°F | 59°F 1957 | -30°F 1972 | 21% | 16% |
| Dec 10 | 33°F | 15°F | 65°F 1939 | -27°F 1972 | 21% | 16% |
| Dec 11 | 33°F | 15°F | 59°F 1939 | -22°F 1961 | 21% | 17% |
| Dec 12 | 33°F | 15°F | 62°F 2014 | -17°F 1961 | 21% | 17% |
| Dec 13 | 33°F | 14°F | 57°F 1988 | -17°F 1963 | 21% | 17% |
| Dec 14 | 32°F | 14°F | 57°F 1979 | -16°F 2008 | 21% | 17% |
| Dec 15 | 32°F | 14°F | 58°F 2025 | -23°F 1979 | 21% | 17% |
| Dec 16 | 32°F | 14°F | 60°F 1939 | -36°F 1964 | 21% | 17% |
| Dec 17 | 32°F | 14°F | 58°F 1998 | -38°F 1964 | 21% | 17% |
| Dec 18 | 32°F | 13°F | 56°F 1966 | -21°F 1964 | 21% | 17% |
| Dec 19 | 32°F | 13°F | 59°F 1941 | -22°F 1990 | 21% | 18% |
| Dec 20 | 31°F | 13°F | 54°F 2019 | -25°F 1990 | 21% | 18% |
| Dec 21 | 31°F | 13°F | 56°F 2019 | -32°F 1990 | 21% | 18% |
| Dec 22 | 31°F | 13°F | 55°F 1955 | -35°F 1990 | 21% | 18% |
| Dec 23 | 31°F | 13°F | 53°F 2024 | -32°F 1983 | 21% | 18% |
| Dec 24 | 31°F | 13°F | 52°F 1950 | -37°F 1983 | 22% | 18% |
| Dec 25 | 31°F | 12°F | 53°F 1980 | -26°F 1983 | 22% | 18% |
| Dec 26 | 31°F | 12°F | 61°F 1980 | -27°F 1996 | 22% | 18% |
| Dec 27 | 31°F | 12°F | 64°F 1980 | -19°F 1941 | 22% | 18% |
| Dec 28 | 31°F | 12°F | 54°F 1965 | -25°F 1968 | 22% | 18% |
| Dec 29 | 31°F | 12°F | 53°F 1949 | -29°F 1990 | 22% | 18% |
| Dec 30 | 31°F | 12°F | 52°F 1997 | -37°F 1968 | 22% | 19% |
| Dec 31 | 31°F | 12°F | 52°F 1996 | -34°F 1968 | 22% | 19% |
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 4:42 PM
- December 31
- sunrise 8:12 AM, sunset 4:50 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00024144 (Helena Rgnl AP), public domain. Records: NOAA GHCN-Daily, station USW00024144, 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.