Weather on December 21 at Rocky Mountain
Rocky Mountain National Park
Based on 51 years of data from Estes Park, CO
Elevation Note: Rocky Mountain sits at 8,000 ft. Expect temperatures 28°F cooler than the data shown below, which comes from Estes Park, CO at a lower elevation.
Planning Your Visit
December 21st in Rocky Mountain National Park (via Estes Park, CO) typically brings cold winter weather, with average highs around 37°F and lows near 17°F. Over 51 years of records, the warmest December 21st was in 1973 (45°F average), while the coldest was 1990 (-12°F) — a 57°F range across recorded history. Precipitation has occurred on 20% of recorded December 21st dates, with snow falling 20% of the time (heaviest snowfall: 16.7"). The last decade has been 12.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 12.3°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Rocky Mountain? Bundle up with warm layers and protect extremities from the cold. Check road conditions if traveling, as snow is possible.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 53°F | 29°F | 0" | -- |
| 2024 | 56°F | 29°F | 0" | 0" |
| 2023 | 51°F | 26°F | 0" | 0" |
| 2022 | 37°F | 26°F | 0" | 0" |
| 2021 | 46°F | 35°F | -- | -- |
| 2020 | 41°F | 29°F | 0" | 0" |
| 2019 | 45°F | 23°F | 0" | 0" |
| 2018 | 41°F | 18°F | 0" | 0" |
| 2017 | 46°F | 14°F | 0.08" | 1.1" |
| 2016 | 42°F | 35°F | 0" | 0" |
| 2015 | 39°F | 25°F | 0" | 0.1" |
| 2014 | 38°F | 27°F | 0" | 0" |
| 2013 | 34°F | 12°F | 0" | 0" |
| 2012 | 34°F | 14°F | 0" | 0" |
| 2011 | 39°F | 9°F | 0" | 0" |
| 2010 | 35°F | 22°F | 0.51" | 1.3" |
| 2009 | 40°F | 32°F | 0" | 0" |
| 2008 | 13°F | 7°F | 0" | 0" |
| 2007 | 37°F | 23°F | 0" | 0" |
| 2006 | 24°F | 18°F | 2.46" | 16.7" |
| 2005 | 41°F | 32°F | 0" | 0" |
| 2004 | 39°F | 16°F | 0" | 0" |
| 2003 | 51°F | 37°F | 0" | 0" |
| 2002 | 32°F | 17°F | 0" | 0.1" |
| 2001 | 42°F | 19°F | 0" | 0" |
| 2000 | 18°F | 10°F | 0.03" | 0.2" |
| 1999 | 20°F | 14°F | 0.03" | 0.1" |
| 1998 | 1°F | -11°F | 0.91" | 4.1" |
| 1997 | 41°F | 11°F | 0" | 0" |
| 1996 | 28°F | 18°F | 0.28" | 2.2" |
| 1995 | 29°F | -9°F | -- | -- |
| 1994 | 52°F | 26°F | 0" | 0" |
| 1993 | 32°F | 15°F | 0.28" | 2" |
| 1992 | 34°F | 16°F | 0" | 0" |
| 1991 | 49°F | 5°F | 0" | 0" |
| 1990 | 0°F | -24°F | 0.51" | -- |
| 1989 | 34°F | -6°F | 0" | 0" |
| 1988 | 39°F | 24°F | 0" | 0" |
| 1986 | 44°F | 11°F | 0" | -- |
| 1983 | 9°F | -20°F | 0" | -- |
| 1982 | 49°F | 36°F | 0" | 0" |
| 1981 | 48°F | 30°F | 0.03" | -- |
| 1980 | 45°F | 26°F | 0" | 0" |
| 1978 | 30°F | -3°F | 0" | -- |
| 1977 | 39°F | 16°F | 0" | -- |
| 1976 | 43°F | 7°F | 0" | 0" |
| 1975 | 47°F | 8°F | 0" | -- |
| 1974 | 42°F | 19°F | 0" | 0" |
| 1973 | 53°F | 38°F | 0" | 0" |
| 1972 | 44°F | 24°F | 0" | -- |
| 1971 | 43°F | 27°F | 0" | -- |