Custer County Weather in December
Average highs run from 40°F on December 1 to 32°F on December 31, and lows from 13°F to 6°F. Normal precipitation for the month is 0.41 in over about 6 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
- 35°F
- Average low
- 9°F
- Precipitation
- 0.41 in
- Snowfall
- 5.5 in
- Record high
- 70°FDec 1, 2021
- Record low
- -38°FDec 24, 1983
- Chance of a freeze
- 100%
- Daylight
- 8 h 53 min to 8 h 41 min
- Cloud cover
- 66%
- Humidity
- 75%
- Dew point
- 18°F
- Wind
- 11.0 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 | 40°F | 13°F | 70°F 2021 | -22°F 1985 | 17% | 13% |
| Dec 2 | 39°F | 13°F | 63°F 1949 | -33°F 1985 | 17% | 13% |
| Dec 3 | 39°F | 12°F | 60°F 1943 | -12°F 1972 | 17% | 13% |
| Dec 4 | 39°F | 12°F | 67°F 1979 | -21°F 1972 | 18% | 13% |
| Dec 5 | 38°F | 12°F | 69°F 1939 | -27°F 2013 | 18% | 13% |
| Dec 6 | 38°F | 11°F | 68°F 1939 | -30°F 2013 | 18% | 13% |
| Dec 7 | 37°F | 11°F | 59°F 2024 | -36°F 2013 | 18% | 14% |
| Dec 8 | 37°F | 11°F | 67°F 2020 | -29°F 2013 | 18% | 14% |
| Dec 9 | 37°F | 10°F | 66°F 1957 | -35°F 1977 | 18% | 14% |
| Dec 10 | 36°F | 10°F | 61°F 1956 | -21°F 2000 | 18% | 14% |
| Dec 11 | 36°F | 10°F | 61°F 2004 | -20°F 2000 | 18% | 14% |
| Dec 12 | 36°F | 9°F | 60°F 2017 | -24°F 2000 | 18% | 14% |
| Dec 13 | 36°F | 9°F | 54°F 1988 | -25°F 1985 | 18% | 15% |
| Dec 14 | 35°F | 9°F | 56°F 1939 | -24°F 1963 | 18% | 15% |
| Dec 15 | 35°F | 9°F | 66°F 1980 | -26°F 1945 | 19% | 15% |
| Dec 16 | 35°F | 8°F | 61°F 1942 | -27°F 1964 | 19% | 15% |
| Dec 17 | 35°F | 8°F | 64°F 1998 | -29°F 1964 | 19% | 15% |
| Dec 18 | 34°F | 8°F | 62°F 1979 | -25°F 1983 | 19% | 15% |
| Dec 19 | 34°F | 8°F | 60°F 2004 | -19°F 1990 | 19% | 16% |
| Dec 20 | 34°F | 7°F | 57°F 1954 | -31°F 1951 | 19% | 16% |
| Dec 21 | 34°F | 7°F | 55°F 1954 | -30°F 1990 | 20% | 16% |
| Dec 22 | 33°F | 7°F | 60°F 1954 | -34°F 1990 | 20% | 16% |
| Dec 23 | 33°F | 7°F | 51°F 1963 | -33°F 1983 | 20% | 16% |
| Dec 24 | 33°F | 7°F | 54°F 1963 | -38°F 1983 | 20% | 17% |
| Dec 25 | 33°F | 6°F | 53°F 1963 | -32°F 1983 | 20% | 17% |
| Dec 26 | 33°F | 6°F | 54°F 1976 | -25°F 1951 | 20% | 17% |
| Dec 27 | 33°F | 6°F | 55°F 1956 | -20°F 2021 | 21% | 17% |
| Dec 28 | 33°F | 6°F | 60°F 2011 | -20°F 1946 | 21% | 17% |
| Dec 29 | 33°F | 6°F | 60°F 1956 | -28°F 1990 | 21% | 17% |
| Dec 30 | 33°F | 6°F | 53°F 1980 | -28°F 1968 | 21% | 17% |
| Dec 31 | 32°F | 6°F | 57°F 1963 | -30°F 1978 | 21% | 17% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:25 AM, sunset 4:18 PM
- December 31
- sunrise 7:45 AM, sunset 4:26 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00245754 (Mizpah 4 Nnw), public domain. Records: NOAA GHCN-Daily, station USW00024037, 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.