Castle Rock Weather in December
Average highs run from 48°F on December 1 to 45°F on December 31, and lows from 21°F to 17°F. Normal precipitation for the month is 0.69 in over about 5 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
- 46°F
- Average low
- 18°F
- Precipitation
- 0.69 in
- Snowfall
- 8.9 in
- Record high
- 76°FDec 22, 2025
- Record low
- -16°FDec 22, 2022
- Chance of a freeze
- 100%
- Daylight
- 9 h 36 min to 9 h 27 min
- Cloud cover
- 55%
- Humidity
- 56%
- Dew point
- 14°F
- Wind
- 8.9 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 | 48°F | 21°F | 71°F 1998 | 10°F 2005 | 15% | 13% |
| Dec 2 | 48°F | 20°F | 73°F 2021 | 2°F 2006 | 15% | 13% |
| Dec 3 | 48°F | 20°F | 68°F 2010 | 0°F 2006 | 15% | 13% |
| Dec 4 | 47°F | 20°F | 69°F 2007 | -8°F 2013 | 15% | 13% |
| Dec 5 | 47°F | 20°F | 69°F 2012 | -13°F 2013 | 15% | 13% |
| Dec 6 | 47°F | 19°F | 70°F 2023 | -13°F 2013 | 15% | 13% |
| Dec 7 | 47°F | 19°F | 64°F 2008 | -11°F 2005 | 15% | 13% |
| Dec 8 | 46°F | 19°F | 70°F 2020 | -8°F 2009 | 15% | 13% |
| Dec 9 | 46°F | 19°F | 68°F 2020 | -13°F 2009 | 15% | 14% |
| Dec 10 | 46°F | 18°F | 65°F 2015 | 3°F 1998 | 15% | 14% |
| Dec 11 | 46°F | 18°F | 69°F 2004 | -1°F 2000 | 15% | 14% |
| Dec 12 | 46°F | 18°F | 68°F 2014 | 1°F 2000 | 15% | 14% |
| Dec 13 | 45°F | 18°F | 64°F 2021 | 5°F 2000 | 15% | 14% |
| Dec 14 | 45°F | 18°F | 67°F 2025 | -5°F 2008 | 15% | 14% |
| Dec 15 | 45°F | 18°F | 69°F 2025 | -9°F 2008 | 15% | 14% |
| Dec 16 | 45°F | 17°F | 65°F 2025 | -3°F 2008 | 15% | 14% |
| Dec 17 | 45°F | 17°F | 69°F 2025 | -5°F 2016 | 15% | 14% |
| Dec 18 | 45°F | 17°F | 65°F 2013 | -4°F 2016 | 15% | 14% |
| Dec 19 | 45°F | 17°F | 69°F 2025 | -2°F 1998 | 15% | 14% |
| Dec 20 | 45°F | 17°F | 67°F 2024 | -3°F 1998 | 15% | 14% |
| Dec 21 | 45°F | 17°F | 67°F 2025 | -11°F 1998 | 15% | 14% |
| Dec 22 | 45°F | 17°F | 76°F 2025 | -16°F 2022 | 15% | 14% |
| Dec 23 | 45°F | 17°F | 73°F 2025 | -14°F 1998 | 15% | 14% |
| Dec 24 | 45°F | 17°F | 69°F 2025 | -9°F 1998 | 15% | 14% |
| Dec 25 | 45°F | 17°F | 71°F 2025 | 2°F 2012 | 15% | 13% |
| Dec 26 | 45°F | 17°F | 67°F 2025 | 2°F 2012 | 15% | 13% |
| Dec 27 | 45°F | 17°F | 63°F 2022 | 1°F 2014 | 14% | 13% |
| Dec 28 | 45°F | 17°F | 61°F 2002 | -1°F 2007 | 14% | 13% |
| Dec 29 | 45°F | 17°F | 62°F 2017 | 0°F 2014 | 14% | 13% |
| Dec 30 | 45°F | 17°F | 64°F 2016 | -13°F 2014 | 14% | 13% |
| Dec 31 | 45°F | 17°F | 64°F 2005 | -12°F 2014 | 14% | 13% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:00 AM, sunset 4:36 PM
- December 31
- sunrise 7:19 AM, sunset 4:46 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00051401 (Castle Rock), public domain. Records: NOAA GHCN-Daily, station USW00093067, 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.