Custer County Weather in December
Average highs run from 42°F on December 1 to 39°F on December 31, and lows from 18°F to 15°F. Normal precipitation for the month is 0.53 in over about 4 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
- 15°F
- Precipitation
- 0.53 in
- Snowfall
- 7.5 in
- Record high
- 63°FDec 8, 2020
- Record low
- -33°FDec 22, 2022
- Chance of a freeze
- 100%
- Daylight
- 9 h 10 min to 9 h 00 min
- Cloud cover
- 62%
- Humidity
- 71%
- Dew point
- 17°F
- Wind
- 10.3 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 | 42°F | 18°F | 57°F 2021 | 5°F 2025 | 12% | 10% |
| Dec 2 | 42°F | 18°F | 60°F 2021 | 2°F 2006 | 12% | 10% |
| Dec 3 | 42°F | 18°F | 54°F 2024 | -1°F 2009 | 12% | 11% |
| Dec 4 | 41°F | 17°F | 60°F 2020 | -11°F 2013 | 12% | 11% |
| Dec 5 | 41°F | 17°F | 54°F 2023 | -17°F 2013 | 12% | 11% |
| Dec 6 | 41°F | 17°F | 62°F 2023 | -21°F 2013 | 12% | 11% |
| Dec 7 | 40°F | 17°F | 58°F 2020 | -18°F 2005 | 12% | 11% |
| Dec 8 | 40°F | 16°F | 63°F 2020 | -10°F 2013 | 12% | 11% |
| Dec 9 | 40°F | 16°F | 60°F 2020 | -16°F 2009 | 12% | 11% |
| Dec 10 | 40°F | 16°F | 54°F 2017 | -7°F 2000 | 12% | 11% |
| Dec 11 | 40°F | 16°F | 53°F 2004 | -15°F 2000 | 12% | 11% |
| Dec 12 | 39°F | 16°F | 58°F 2017 | -15°F 2000 | 12% | 11% |
| Dec 13 | 39°F | 15°F | 49°F 2002 | -9°F 2000 | 12% | 11% |
| Dec 14 | 39°F | 15°F | 57°F 2025 | -23°F 2008 | 12% | 11% |
| Dec 15 | 39°F | 15°F | 54°F 2025 | -24°F 2008 | 12% | 11% |
| Dec 16 | 39°F | 15°F | 57°F 2025 | -10°F 2008 | 12% | 11% |
| Dec 17 | 39°F | 15°F | 50°F 2025 | -22°F 2016 | 12% | 11% |
| Dec 18 | 39°F | 15°F | 55°F 2011 | -9°F 2016 | 12% | 11% |
| Dec 19 | 39°F | 15°F | 58°F 2023 | -1°F 2013 | 12% | 11% |
| Dec 20 | 38°F | 15°F | 57°F 2003 | -14°F 2008 | 12% | 11% |
| Dec 21 | 38°F | 14°F | 58°F 2024 | -31°F 2022 | 12% | 11% |
| Dec 22 | 38°F | 14°F | 57°F 2025 | -33°F 2022 | 12% | 11% |
| Dec 23 | 38°F | 14°F | 57°F 2025 | -16°F 2004 | 12% | 11% |
| Dec 24 | 38°F | 14°F | 59°F 2025 | -4°F 2009 | 13% | 11% |
| Dec 25 | 38°F | 14°F | 57°F 2025 | -6°F 2017 | 13% | 11% |
| Dec 26 | 39°F | 14°F | 54°F 2005 | -7°F 2017 | 13% | 11% |
| Dec 27 | 39°F | 14°F | 61°F 2013 | -1°F 2012 | 13% | 11% |
| Dec 28 | 39°F | 14°F | 55°F 1999 | -4°F 2012 | 13% | 11% |
| Dec 29 | 39°F | 14°F | 52°F 1999 | -4°F 2017 | 13% | 11% |
| Dec 30 | 39°F | 14°F | 47°F 2023 | -9°F 2017 | 13% | 11% |
| Dec 31 | 39°F | 15°F | 54°F 2025 | -10°F 2017 | 13% | 11% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:08 AM, sunset 4:18 PM
- December 31
- sunrise 7:27 AM, sunset 4:27 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00399347 (Wind Cave), public domain. Records: NOAA GHCN-Daily, station USW00094032, 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.