Custer County Weather in December
Average highs run from 32°F on December 1 to 28°F on December 31, and lows from 15°F to 9°F. Normal precipitation for the month is 0.52 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
- 29°F
- Average low
- 11°F
- Precipitation
- 0.52 in
- Record high
- 63°FDec 2, 2021
- Record low
- -23°FDec 18, 2016
- Chance of a freeze
- 100%
- Daylight
- 9 h 06 min to 8 h 55 min
- Cloud cover
- 64%
- Humidity
- 90%
- Dew point
- 10°F
- Wind
- 5.8 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 32°F | 15°F | 62°F 2021 | -6°F 2015 | 22% |
| Dec 2 | 32°F | 14°F | 63°F 2021 | -3°F 2015 | 22% |
| Dec 3 | 32°F | 14°F | 51°F 2021 | -3°F 2022 | 22% |
| Dec 4 | 31°F | 14°F | 58°F 2021 | -6°F 2005 | 22% |
| Dec 5 | 31°F | 13°F | 52°F 2023 | -12°F 2013 | 22% |
| Dec 6 | 30°F | 13°F | 52°F 2023 | -11°F 2005 | 22% |
| Dec 7 | 30°F | 13°F | 48°F 2021 | -20°F 2005 | 22% |
| Dec 8 | 30°F | 12°F | 50°F 2015 | -22°F 2005 | 22% |
| Dec 9 | 30°F | 12°F | 55°F 2025 | -15°F 2013 | 22% |
| Dec 10 | 29°F | 12°F | 57°F 2025 | -14°F 2009 | 22% |
| Dec 11 | 29°F | 11°F | 60°F 2025 | -11°F 2009 | 22% |
| Dec 12 | 29°F | 11°F | 59°F 2025 | -9°F 2005 | 22% |
| Dec 13 | 29°F | 11°F | 51°F 2025 | -7°F 2005 | 22% |
| Dec 14 | 28°F | 11°F | 50°F 2002 | -3°F 2005 | 22% |
| Dec 15 | 28°F | 10°F | 50°F 2002 | -10°F 2005 | 23% |
| Dec 16 | 28°F | 10°F | 55°F 2025 | -14°F 2005 | 23% |
| Dec 17 | 28°F | 10°F | 53°F 2025 | -21°F 2016 | 23% |
| Dec 18 | 28°F | 10°F | 50°F 2024 | -23°F 2016 | 23% |
| Dec 19 | 28°F | 10°F | 47°F 2017 | -15°F 2016 | 23% |
| Dec 20 | 28°F | 10°F | 47°F 2021 | -17°F 1998 | 23% |
| Dec 21 | 28°F | 9°F | 46°F 2021 | -21°F 1998 | 23% |
| Dec 22 | 28°F | 9°F | 45°F 2025 | -21°F 2016 | 23% |
| Dec 23 | 28°F | 9°F | 46°F 2005 | -16°F 2016 | 23% |
| Dec 24 | 28°F | 9°F | 48°F 2025 | -13°F 2001 | 23% |
| Dec 25 | 28°F | 9°F | 46°F 2025 | -13°F 2001 | 23% |
| Dec 26 | 28°F | 9°F | 44°F 2025 | -14°F 2001 | 23% |
| Dec 27 | 28°F | 9°F | 47°F 2022 | -9°F 2015 | 23% |
| Dec 28 | 28°F | 9°F | 47°F 2002 | -10°F 2020 | 23% |
| Dec 29 | 28°F | 9°F | 53°F 2017 | -12°F 2020 | 23% |
| Dec 30 | 28°F | 9°F | 50°F 2017 | -13°F 2014 | 23% |
| Dec 31 | 28°F | 9°F | 42°F 2008 | -13°F 2014 | 23% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:53 AM, sunset 4:59 PM
- December 31
- sunrise 8:13 AM, sunset 5:08 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00004114 (Challis AP), public domain. Records: NOAA GHCN-Daily, station USW00004114, 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.