Weather on December 18
Alamosa, CO
55 Years of Data
Avg High
35°F
Avg Low
-1°F
Warmest
2025
33°F avg
Coldest
1996
0°F avg
About This Date
December 18th in Alamosa, CO typically brings cold winter weather, with average highs around 35°F and lows near -1°F — a 36°F daily swing. Over 55 years of records, the warmest December 18th was in 2025 (33°F average), while the coldest was 1996 (0°F) — a 33°F range across recorded history. Precipitation has occurred on 15% of recorded December 18th dates, with snow falling 15% of the time (heaviest snowfall: 1.4"). The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
Planning for December 18th in Alamosa, CO? Bundle up with warm layers and protect extremities from the cold.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 55° | 10° | 33° | — | — |
| 2024 | 48° | 9° | 28° | — | — |
| 2023 | 36° | -4° | 16° | — | — |
| 2022 | 30° | -8° | 11° | — | — |
| 2021 | 39° | -5° | 17° | — | — |
| 2020 | 28° | -5° | 12° | — | — |
| 2019 | 21° | -10° | 6° | — | — |
| 2018 | 42° | 6° | 24° | — | — |
| 2017 | 45° | 4° | 24° | — | — |
| 2016 | 29° | -2° | 13° | 0.05" | 0.8" |
| 2015 | 30° | -1° | 15° | — | — |
| 2014 | 35° | 13° | 24° | 0.05" | 0.6" |
| 2013 | 34° | -1° | 17° | — | — |
| 2012 | 27° | -9° | 9° | — | — |
| 2011 | 29° | -6° | 12° | — | — |
| 2010 | 30° | 8° | 19° | 0.03" | 0.1" |
| 2009 | 43° | -2° | 20° | — | — |
| 2008 | 37° | 18° | 27° | 0.03" | 0.3" |
| 2007 | 22° | -15° | 4° | — | — |
| 2006 | 42° | 14° | 28° | — | — |
| 2005 | 36° | -5° | 15° | — | — |
| 2004 | 44° | 1° | 23° | — | — |
| 2003 | 37° | -2° | 18° | — | — |
| 2002 | 32° | 4° | 18° | — | — |
| 2001 | 41° | -2° | 20° | — | — |
| 2000 | 27° | -2° | 12° | — | — |
| 1999 | 37° | 1° | 19° | — | — |
| 1998 | 51° | 3° | 27° | — | — |
| 1997 | 24° | -6° | 9° | — | — |
| 1996coldest | 19° | -19° | 0° | — | — |
| 1995 | 34° | 2° | 18° | — | — |
| 1994 | 39° | 3° | 21° | — | — |
| 1993 | 33° | 0° | 17° | — | — |
| 1992 | 30° | -15° | 8° | — | — |
| 1991 | 20° | -16° | 2° | 0.36" | 1.4" |
| 1990 | 21° | -17° | 2° | — | — |
| 1989 | 35° | 2° | 18° | — | — |
| 1988 | 39° | -2° | 19° | — | — |
| 1987 | 35° | 19° | 27° | 0.05" | 0.3" |
| 1986 | 34° | 18° | 26° | — | — |
| 1985 | 35° | -5° | 15° | — | — |
| 1984 | 40° | -8° | 16° | — | — |
| 1983 | 29° | -1° | 14° | — | — |
| 1982 | 44° | 8° | 26° | — | — |
| 1981 | 42° | -4° | 19° | — | — |
| 1980 | 53° | 6° | 30° | — | — |
| 1979 | 45° | -5° | 20° | — | — |
| 1978 | 38° | 12° | 25° | 0.05" | 0.2" |
| 1977 | 42° | 6° | 24° | — | — |
| 1976 | 32° | -11° | 11° | — | — |
| 1975 | 30° | -8° | 11° | — | — |
| 1974 | 34° | 6° | 20° | — | — |
| 1973 | 37° | 1° | 19° | 0.2" | 1.3" |
| 1972 | 33° | -6° | 14° | — | — |
| 1971 | 18° | -16° | 1° | — | — |
55 years of data from ALAMOSA 1E