Weather on December 20 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 20th in Great Sand Dunes National Park (via Alamosa, CO) typically brings cold winter weather, with average highs around 35°F and lows near 0°F — a 35°F daily swing. Over 55 years of records, the warmest December 20th was in 1998 (35°F average), while the coldest was 1992 (-6°F) — a 41°F range across recorded history. Precipitation has occurred on 13% of recorded December 20th dates, with snow falling 11% of the time (heaviest snowfall: 2"). Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for December 20th 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 | -- | 13°F | 0" | -- |
| 2024 | 48°F | 3°F | 0" | 0" |
| 2023 | 36°F | 7°F | 0" | 0" |
| 2022 | 37°F | -6°F | 0" | 0" |
| 2021 | 41°F | -3°F | 0" | 0" |
| 2020 | 34°F | 1°F | 0" | 0" |
| 2019 | 26°F | -11°F | 0" | 0" |
| 2018 | 46°F | 8°F | 0" | 0" |
| 2017 | 47°F | 5°F | 0" | 0" |
| 2016 | 23°F | -7°F | 0" | 0" |
| 2015 | 38°F | 4°F | 0" | 0" |
| 2014 | 36°F | 8°F | 0" | 0" |
| 2013 | 33°F | 0°F | 0" | 0" |
| 2012 | 31°F | -21°F | 0.05" | 0.2" |
| 2011 | 35°F | -1°F | 0" | 0" |
| 2010 | 43°F | 18°F | 0" | 0" |
| 2009 | 35°F | -2°F | 0" | 0" |
| 2008 | 35°F | 12°F | 0" | 0" |
| 2007 | 27°F | -7°F | 0" | 0" |
| 2006 | 37°F | 19°F | 0.15" | 1.8" |
| 2005 | 46°F | 3°F | 0" | 0" |
| 2004 | 50°F | -2°F | 0" | 0" |
| 2003 | 38°F | -1°F | 0" | 0" |
| 2002 | 36°F | -6°F | 0" | 0" |
| 2001 | 39°F | -4°F | 0" | 0" |
| 2000 | 39°F | 1°F | 0" | 0" |
| 1999 | 34°F | -3°F | 0" | 0" |
| 1998 | 40°F | 30°F | 0" | 0" |
| 1997 | 21°F | -8°F | 0" | 0" |
| 1996 | 33°F | -7°F | 0" | 0" |
| 1995 | 31°F | 0°F | 0" | 0" |
| 1994 | 40°F | 3°F | 0" | 0" |
| 1993 | 25°F | -11°F | 0.03" | 0" |
| 1992 | 14°F | -27°F | 0" | 0" |
| 1991 | 36°F | 1°F | 0.03" | 0.1" |
| 1990 | 28°F | 16°F | 0.43" | 2" |
| 1989 | 39°F | -5°F | 0" | 0" |
| 1988 | 37°F | -1°F | 0" | 0" |
| 1987 | 29°F | 6°F | 0" | 0" |
| 1986 | 32°F | 0°F | 0" | 0" |
| 1985 | 37°F | 0°F | 0" | 0" |
| 1984 | 34°F | -1°F | 0.15" | 1" |
| 1983 | 33°F | 7°F | 0.03" | 0.1" |
| 1982 | 43°F | 3°F | 0" | 0" |
| 1981 | 56°F | 11°F | 0" | 0" |
| 1980 | 35°F | 7°F | 0" | 0" |
| 1979 | 42°F | -2°F | 0" | 0" |
| 1978 | 25°F | -2°F | 0" | 0" |
| 1977 | 27°F | -3°F | 0" | 0" |
| 1976 | 29°F | -12°F | 0" | 0" |
| 1975 | 30°F | -8°F | 0" | 0" |
| 1974 | 33°F | -3°F | 0" | 0" |
| 1973 | 34°F | -9°F | 0" | 0" |
| 1972 | 34°F | -4°F | 0" | 0" |
| 1971 | 25°F | -16°F | 0" | 0" |