Lewistown Weather in December
Average highs run from 44°F on December 1 to 35°F on December 31, and lows from 27°F to 20°F. Normal precipitation for the month is 1.91 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
- 39°F
- Average low
- 23°F
- Precipitation
- 1.91 in
- Snowfall
- 4.0 in
- Record high
- 76°FDec 16, 2021
- Record low
- -21°FDec 22, 1989
- Chance of a freeze
- 100%
- Daylight
- 9 h 32 min to 9 h 23 min
- Cloud cover
- 66%
- Humidity
- 83%
- Dew point
- 25°F
- Wind
- 10.5 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 | 44°F | 27°F | 69°F 1973 | 8°F 1976 | 23% | 6% |
| Dec 2 | 43°F | 27°F | 69°F 1973 | 2°F 1942 | 23% | 6% |
| Dec 3 | 43°F | 27°F | 71°F 1970 | 2°F 1940 | 23% | 6% |
| Dec 4 | 42°F | 26°F | 74°F 2012 | 2°F 1991 | 23% | 7% |
| Dec 5 | 42°F | 26°F | 70°F 1998 | 3°F 1991 | 23% | 7% |
| Dec 6 | 42°F | 26°F | 70°F 1951 | -2°F 1977 | 23% | 7% |
| Dec 7 | 41°F | 26°F | 71°F 1980 | -7°F 1976 | 23% | 7% |
| Dec 8 | 41°F | 25°F | 67°F 1946 | -6°F 1976 | 23% | 7% |
| Dec 9 | 41°F | 25°F | 74°F 1991 | -4°F 2005 | 23% | 8% |
| Dec 10 | 40°F | 25°F | 64°F 2020 | -5°F 1977 | 23% | 8% |
| Dec 11 | 40°F | 25°F | 70°F 1949 | -3°F 1962 | 23% | 8% |
| Dec 12 | 39°F | 24°F | 65°F 1979 | -9°F 1962 | 23% | 8% |
| Dec 13 | 39°F | 24°F | 69°F 1991 | -3°F 1989 | 23% | 8% |
| Dec 14 | 39°F | 24°F | 67°F 1975 | -3°F 1943 | 23% | 8% |
| Dec 15 | 39°F | 24°F | 72°F 1948 | -13°F 1989 | 23% | 8% |
| Dec 16 | 38°F | 23°F | 76°F 2021 | -13°F 1989 | 22% | 8% |
| Dec 17 | 38°F | 23°F | 66°F 2006 | -7°F 1989 | 22% | 9% |
| Dec 18 | 38°F | 23°F | 69°F 1939 | -7°F 1981 | 22% | 9% |
| Dec 19 | 37°F | 23°F | 63°F 2002 | -14°F 1983 | 22% | 9% |
| Dec 20 | 37°F | 22°F | 68°F 1949 | -13°F 1983 | 22% | 9% |
| Dec 21 | 37°F | 22°F | 62°F 1941 | -14°F 1989 | 22% | 9% |
| Dec 22 | 37°F | 22°F | 64°F 1933 | -21°F 1989 | 22% | 9% |
| Dec 23 | 36°F | 22°F | 67°F 1933 | -21°F 1989 | 22% | 9% |
| Dec 24 | 36°F | 21°F | 66°F 1955 | -20°F 1989 | 22% | 9% |
| Dec 25 | 36°F | 21°F | 71°F 2021 | -18°F 1983 | 22% | 10% |
| Dec 26 | 36°F | 21°F | 67°F 2019 | -6°F 1935 | 22% | 10% |
| Dec 27 | 36°F | 21°F | 70°F 1946 | -6°F 2017 | 22% | 10% |
| Dec 28 | 36°F | 20°F | 66°F 1984 | -7°F 1961 | 22% | 10% |
| Dec 29 | 35°F | 20°F | 72°F 1984 | -5°F 1983 | 22% | 10% |
| Dec 30 | 35°F | 20°F | 71°F 2022 | -7°F 1983 | 22% | 10% |
| Dec 31 | 35°F | 20°F | 65°F 1951 | -13°F 1976 | 22% | 10% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 7:10 AM, sunset 4:42 PM
- December 31
- sunrise 7:29 AM, sunset 4:52 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00238051 (Steffenville), public domain. Records: NOAA GHCN-Daily, station USC00233601, 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.