Lewis and Clark County Weather in December
Average highs run from 37°F on December 1 to 34°F on December 31, and lows from 20°F to 17°F. Normal precipitation for the month is 0.76 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
- 34°F
- Average low
- 18°F
- Precipitation
- 0.76 in
- Snowfall
- 6.2 in
- Record high
- 66°FDec 1, 2021
- Record low
- -40°FDec 16, 2016
- Chance of a freeze
- 100%
- Daylight
- 8 h 47 min to 8 h 34 min
- Cloud cover
- 70%
- Humidity
- 92%
- Dew point
- 16°F
- Wind
- 6.9 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 | 37°F | 20°F | 66°F 2021 | -27°F 1985 | 20% | 8% |
| Dec 2 | 36°F | 20°F | 57°F 2008 | -28°F 1985 | 20% | 9% |
| Dec 3 | 36°F | 20°F | 55°F 1975 | -15°F 1972 | 20% | 9% |
| Dec 4 | 36°F | 19°F | 60°F 1989 | -28°F 1972 | 20% | 9% |
| Dec 5 | 36°F | 19°F | 57°F 1987 | -26°F 2013 | 20% | 9% |
| Dec 6 | 35°F | 19°F | 55°F 1987 | -32°F 1977 | 20% | 9% |
| Dec 7 | 35°F | 19°F | 57°F 1987 | -32°F 2013 | 20% | 9% |
| Dec 8 | 35°F | 18°F | 57°F 2020 | -35°F 1972 | 21% | 9% |
| Dec 9 | 35°F | 18°F | 58°F 1975 | -29°F 2009 | 21% | 9% |
| Dec 10 | 34°F | 18°F | 60°F 1990 | -20°F 1972 | 21% | 10% |
| Dec 11 | 34°F | 18°F | 56°F 1990 | -25°F 1989 | 21% | 10% |
| Dec 12 | 34°F | 18°F | 58°F 2014 | -23°F 2000 | 21% | 10% |
| Dec 13 | 34°F | 17°F | 54°F 2010 | -25°F 2016 | 21% | 10% |
| Dec 14 | 34°F | 17°F | 53°F 1998 | -25°F 2008 | 21% | 11% |
| Dec 15 | 34°F | 17°F | 53°F 1998 | -29°F 1964 | 21% | 11% |
| Dec 16 | 34°F | 17°F | 59°F 1980 | -40°F 2016 | 22% | 11% |
| Dec 17 | 34°F | 17°F | 59°F 1980 | -37°F 1964 | 22% | 11% |
| Dec 18 | 34°F | 17°F | 54°F 1979 | -23°F 1983 | 22% | 12% |
| Dec 19 | 34°F | 17°F | 57°F 2004 | -25°F 1990 | 22% | 12% |
| Dec 20 | 34°F | 17°F | 52°F 1979 | -35°F 1990 | 22% | 12% |
| Dec 21 | 34°F | 17°F | 55°F 2019 | -35°F 1990 | 22% | 12% |
| Dec 22 | 34°F | 17°F | 52°F 2005 | -23°F 1983 | 22% | 12% |
| Dec 23 | 34°F | 17°F | 52°F 2020 | -22°F 1989 | 22% | 13% |
| Dec 24 | 34°F | 17°F | 50°F 2005 | -38°F 1983 | 22% | 13% |
| Dec 25 | 34°F | 17°F | 58°F 2005 | -27°F 1983 | 22% | 13% |
| Dec 26 | 34°F | 17°F | 54°F 1980 | -37°F 2021 | 22% | 13% |
| Dec 27 | 34°F | 17°F | 56°F 1980 | -37°F 2021 | 22% | 13% |
| Dec 28 | 34°F | 17°F | 52°F 1989 | -25°F 1990 | 22% | 13% |
| Dec 29 | 34°F | 17°F | 50°F 1980 | -39°F 1968 | 23% | 14% |
| Dec 30 | 34°F | 17°F | 52°F 1997 | -31°F 2017 | 23% | 14% |
| Dec 31 | 34°F | 17°F | 49°F 2005 | -31°F 2017 | 23% | 14% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:55 AM, sunset 4:42 PM
- December 31
- sunrise 8:16 AM, sunset 4:50 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00247159 (Rogers Pass 9 Nne), public domain. Records: NOAA GHCN-Daily, station USC00247159, 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.