Weather on December 21 at Great Sand Dunes
Great Sand Dunes National Park and Preserve
Based on 55 years of data from Alamosa, CO
Elevation Note: Great Sand Dunes sits at 8,200 ft. Expect temperatures 29°F cooler than the data shown below, which comes from Alamosa, CO at a lower elevation.
Planning Your Visit
December 21st in Great Sand Dunes National Park (via Alamosa, CO) typically brings cold winter weather, with average highs around 36°F and lows near 0°F — a 36°F daily swing. Over 55 years of records, the warmest December 21st was in 2010 (42°F average), while the coldest was 2012 (-4°F) — a 46°F range across recorded history. Precipitation has occurred on 13% of recorded December 21st dates, with snow falling 13% of the time (heaviest snowfall: 2.5"). The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Great Sand Dunes? Bundle up with warm layers and protect extremities from the cold.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 59°F | 19°F | 0" | -- |
| 2024 | 45°F | 3°F | 0" | 0" |
| 2023 | 40°F | 19°F | 0" | 0" |
| 2022 | 34°F | -4°F | 0" | 0" |
| 2021 | 47°F | -3°F | 0" | 0" |
| 2020 | 37°F | 5°F | 0" | 0" |
| 2019 | 33°F | -8°F | 0" | 0" |
| 2018 | 45°F | 6°F | 0" | 0" |
| 2017 | 53°F | 7°F | 0" | 0" |
| 2016 | 29°F | 3°F | 0" | 0" |
| 2015 | 42°F | 8°F | 0" | 0" |
| 2014 | 41°F | 8°F | 0" | 0" |
| 2013 | 33°F | -4°F | 0" | 0" |
| 2012 | 18°F | -26°F | 0" | 0" |
| 2011 | 36°F | -1°F | 0" | -- |
| 2010 | 52°F | 32°F | 0" | 0" |
| 2009 | 45°F | 1°F | 0" | 0" |
| 2008 | 30°F | -3°F | 0" | 0" |
| 2007 | 30°F | -6°F | 0" | 0" |
| 2006 | 28°F | 0°F | 0.51" | 2.5" |
| 2005 | 48°F | 8°F | 0" | 0" |
| 2004 | 41°F | 18°F | 0" | 0" |
| 2003 | 47°F | 7°F | 0.08" | 0.8" |
| 2002 | 32°F | -1°F | 0" | 0" |
| 2001 | 45°F | 9°F | 0" | 0" |
| 2000 | 38°F | -5°F | 0" | 0" |
| 1999 | 26°F | -3°F | 0" | 0" |
| 1998 | 32°F | -4°F | 0.03" | 0.3" |
| 1997 | 23°F | -4°F | 0" | 0" |
| 1996 | 44°F | 8°F | 0" | 0" |
| 1995 | 31°F | -1°F | 0" | 0" |
| 1994 | 44°F | 4°F | 0" | 0" |
| 1993 | 26°F | -13°F | 0" | 0" |
| 1992 | 20°F | -23°F | 0" | 0" |
| 1991 | 22°F | -4°F | 0" | 0" |
| 1990 | 18°F | -6°F | 0" | 0" |
| 1989 | 40°F | -5°F | 0" | 0" |
| 1988 | 35°F | 1°F | 0.03" | 0.2" |
| 1987 | 28°F | 0°F | 0" | 0" |
| 1986 | 37°F | 6°F | 0" | 0" |
| 1985 | 39°F | -1°F | 0" | 0" |
| 1984 | 32°F | -10°F | 0" | 0" |
| 1983 | 17°F | 5°F | 0.33" | 1.3" |
| 1982 | 48°F | 5°F | 0" | 0" |
| 1981 | 48°F | 25°F | 0.15" | 1" |
| 1980 | 44°F | 2°F | 0" | 0" |
| 1979 | 44°F | 3°F | 0.03" | 0.1" |
| 1978 | 24°F | -13°F | 0" | 0" |
| 1977 | 29°F | -8°F | 0" | 0" |
| 1976 | 29°F | -12°F | 0" | 0" |
| 1975 | 28°F | 2°F | 0" | 0" |
| 1974 | 40°F | 0°F | 0" | 0" |
| 1973 | 44°F | -3°F | 0" | 0" |
| 1972 | 31°F | -6°F | 0" | 0" |
| 1971 | 22°F | -17°F | 0" | 0" |