Weather on December 21
Alamosa, CO
55 Years of Data
Avg High
36°F
Avg Low
0°F
Warmest
2010
40°F avg
Coldest
2012
-4°F avg
About This Date
December 21st in 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 (40°F average), while the coldest was 2012 (-4°F) — a 44°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 Alamosa, CO? Bundle up with warm layers and protect extremities from the cold.
Warming Trend
1.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 59° | 19° | 39° | — | — |
| 2024 | 45° | 3° | 24° | — | — |
| 2023 | 40° | 19° | 29° | — | — |
| 2022 | 34° | -4° | 15° | — | — |
| 2021 | 47° | -3° | 22° | — | — |
| 2020 | 37° | 5° | 21° | — | — |
| 2019 | 33° | -8° | 13° | — | — |
| 2018 | 45° | 6° | 25° | — | — |
| 2017 | 53° | 7° | 30° | — | — |
| 2016 | 29° | 3° | 16° | — | — |
| 2015 | 42° | 8° | 25° | — | — |
| 2014 | 41° | 8° | 25° | — | — |
| 2013 | 33° | -4° | 15° | — | — |
| 2012coldest | 18° | -26° | -4° | — | — |
| 2011 | 36° | -1° | 18° | — | — |
| 2010warmest | 49° | 31° | 40° | — | — |
| 2009 | 45° | 1° | 23° | — | — |
| 2008 | 30° | -3° | 14° | — | — |
| 2007 | 30° | -6° | 12° | — | — |
| 2006 | 28° | 0° | 14° | 0.51" | 2.5" |
| 2005 | 48° | 8° | 28° | — | — |
| 2004 | 41° | 18° | 29° | — | — |
| 2003 | 47° | 7° | 27° | 0.08" | 0.8" |
| 2002 | 32° | -1° | 16° | — | — |
| 2001 | 45° | 9° | 27° | — | — |
| 2000 | 38° | -5° | 16° | — | — |
| 1999 | 26° | -3° | 12° | — | — |
| 1998 | 32° | -4° | 14° | 0.03" | 0.3" |
| 1997 | 23° | -4° | 10° | — | — |
| 1996 | 44° | 8° | 26° | — | — |
| 1995 | 31° | -1° | 15° | — | — |
| 1994 | 44° | 4° | 24° | — | — |
| 1993 | 26° | -13° | 7° | — | — |
| 1992 | 20° | -23° | -2° | — | — |
| 1991 | 22° | -4° | 9° | — | — |
| 1990 | 18° | -6° | 6° | — | — |
| 1989 | 40° | -5° | 17° | — | — |
| 1988 | 35° | 1° | 18° | 0.03" | 0.2" |
| 1987 | 28° | 0° | 14° | — | — |
| 1986 | 37° | 6° | 22° | — | — |
| 1985 | 39° | -1° | 19° | — | — |
| 1984 | 32° | -10° | 11° | — | — |
| 1983 | 17° | 5° | 11° | 0.33" | 1.3" |
| 1982 | 48° | 5° | 27° | — | — |
| 1981 | 48° | 25° | 36° | 0.15" | 1" |
| 1980 | 44° | 2° | 23° | — | — |
| 1979 | 44° | 3° | 24° | 0.03" | 0.1" |
| 1978 | 24° | -13° | 6° | — | — |
| 1977 | 29° | -8° | 11° | — | — |
| 1976 | 29° | -12° | 9° | — | — |
| 1975 | 28° | 2° | 15° | — | — |
| 1974 | 40° | 0° | 20° | — | — |
| 1973 | 44° | -3° | 21° | — | — |
| 1972 | 31° | -6° | 13° | — | — |
| 1971 | 22° | -17° | 3° | — | — |
55 years of data from ALAMOSA 1E