Weather on December 21
Fort Collins, CO
55 Years of Data
Avg High
44°F
Avg Low
17°F
Warmest
2023
46°F avg
Coldest
1990
-12°F avg
About This Date
December 21st in Fort Collins, CO typically brings chilly winter weather, with average highs around 44°F and lows near 17°F — a 27°F daily swing. Over 55 years of records, the warmest December 21st was in 2023 (46°F average), while the coldest was 1990 (-12°F) — a 58°F range across recorded history. Precipitation has occurred on 15% of recorded December 21st dates, with snow falling 15% of the time (heaviest snowfall: 7.7"). The last decade has been 10.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 10.8°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Fort Collins, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
1.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 58° | 29° | 43° | — | — |
| 2024 | 62° | 24° | 43° | — | — |
| 2023warmest | 62° | 30° | 46° | — | — |
| 2022 | 50° | -1° | 25° | 0.08" | 0.6" |
| 2021 | 61° | 21° | 41° | — | — |
| 2020 | 58° | 30° | 44° | — | — |
| 2019 | 56° | 20° | 38° | — | — |
| 2018 | 61° | 22° | 41° | — | — |
| 2017 | 51° | 18° | 34° | 0.18" | 1.4" |
| 2016 | 47° | 27° | 37° | — | — |
| 2015 | 42° | 23° | 33° | — | — |
| 2014 | 55° | 23° | 39° | — | — |
| 2013 | 33° | 13° | 23° | — | — |
| 2012 | 50° | 14° | 32° | — | — |
| 2011 | 38° | 16° | 27° | — | — |
| 2010 | 40° | 27° | 33° | — | — |
| 2009 | 58° | 26° | 42° | — | — |
| 2008 | 23° | 2° | 12° | — | — |
| 2007 | 40° | 20° | 30° | — | — |
| 2006 | 42° | 19° | 31° | 1.55" | 7.7" |
| 2005 | 57° | 25° | 41° | — | — |
| 2004 | 39° | 22° | 30° | — | — |
| 2003 | 51° | 26° | 39° | — | — |
| 2002 | 42° | 22° | 32° | — | — |
| 2001 | 52° | 16° | 34° | — | — |
| 2000 | 31° | 5° | 18° | — | — |
| 1999 | 38° | 26° | 32° | — | — |
| 1998 | 7° | -7° | 0° | 0.05" | 0.3" |
| 1997 | 37° | 13° | 25° | — | — |
| 1996 | 40° | 26° | 33° | — | — |
| 1995 | 35° | 18° | 26° | 0.1" | 0.6" |
| 1994 | 63° | 20° | 41° | — | — |
| 1993 | 28° | 14° | 21° | 0.03" | 0.3" |
| 1992 | 40° | 18° | 29° | — | — |
| 1991 | 48° | 15° | 32° | — | — |
| 1990coldest | -8° | -16° | -12° | 0.13" | 0.7" |
| 1989 | 4° | -5° | -1° | 0.18" | 1.6" |
| 1988 | 42° | 16° | 29° | — | — |
| 1987 | 45° | 9° | 27° | — | — |
| 1986 | 42° | 19° | 31° | — | — |
| 1985 | 53° | 20° | 36° | — | — |
| 1984 | 41° | 27° | 34° | — | — |
| 1983 | -2° | -16° | -9° | — | — |
| 1982 | 53° | 20° | 36° | — | — |
| 1981 | 52° | 33° | 42° | — | — |
| 1980 | 46° | 17° | 32° | — | — |
| 1979 | 48° | 22° | 35° | — | — |
| 1978 | 49° | 9° | 29° | — | — |
| 1977 | 49° | 13° | 31° | — | — |
| 1976 | 53° | 9° | 31° | — | — |
| 1975 | 40° | 12° | 26° | — | — |
| 1974 | 55° | 25° | 40° | — | — |
| 1973 | 50° | 22° | 36° | — | — |
| 1972 | 43° | 18° | 30° | — | — |
| 1971 | 52° | 18° | 35° | — | — |
55 years of data from FT COLLINS