Weather on December 15
Fort Collins, CO
55 Years of Data
Avg High
44°F
Avg Low
18°F
Warmest
1980
48°F avg
Coldest
2008
-2°F avg
About This Date
December 15th in Fort Collins, CO typically brings chilly winter weather, with average highs around 44°F and lows near 18°F — a 26°F daily swing. Over 55 years of records, the warmest December 15th was in 1980 (48°F average), while the coldest was 2008 (-2°F) — a 50°F range across recorded history. Precipitation has occurred on 7% of recorded December 15th dates, with snow falling 9% of the time (heaviest snowfall: 7.4"). The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
Planning for December 15th in Fort Collins, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 66° | 23° | 45° | — | — |
| 2024 | 54° | 29° | 41° | — | — |
| 2023 | 54° | 20° | 37° | — | — |
| 2022 | 35° | 18° | 26° | — | — |
| 2021 | 48° | 22° | 35° | — | — |
| 2020 | 39° | 18° | 28° | — | 0.2" |
| 2019 | 32° | 14° | 23° | — | — |
| 2018 | 57° | 25° | 41° | — | — |
| 2017 | 56° | 17° | 36° | — | — |
| 2016 | 35° | 14° | 25° | — | — |
| 2015 | 32° | 21° | 27° | 1.27" | 7.4" |
| 2014 | 47° | 30° | 38° | — | — |
| 2013 | 52° | 21° | 36° | — | — |
| 2012 | 44° | 25° | 34° | — | — |
| 2011 | 40° | 20° | 30° | — | — |
| 2010 | 46° | 33° | 40° | — | — |
| 2009 | 40° | 11° | 25° | — | — |
| 2008coldest | 7° | -11° | -2° | — | — |
| 2007 | 31° | 1° | 16° | — | — |
| 2006 | 61° | 30° | 45° | — | — |
| 2005 | 37° | 18° | 27° | — | — |
| 2004 | 52° | 27° | 39° | — | — |
| 2003 | 51° | 28° | 40° | — | — |
| 2002 | 63° | 26° | 44° | — | — |
| 2001 | 47° | 20° | 33° | 0.15" | 1.2" |
| 2000 | 47° | 23° | 35° | — | — |
| 1999 | 45° | 20° | 32° | — | — |
| 1998 | 46° | 23° | 35° | — | — |
| 1997 | 61° | 24° | 42° | — | — |
| 1996 | 41° | 15° | 28° | — | — |
| 1995 | 52° | 17° | 34° | — | — |
| 1994 | 44° | 13° | 28° | — | — |
| 1993 | 39° | 17° | 28° | — | — |
| 1992 | 39° | 20° | 29° | — | — |
| 1991 | 47° | 18° | 32° | — | — |
| 1990 | 42° | 12° | 27° | — | — |
| 1989 | 23° | 2° | 12° | 0.15" | 2" |
| 1988 | 27° | 13° | 20° | 0.51" | 4" |
| 1987 | 27° | 0° | 13° | — | — |
| 1986 | 43° | 16° | 29° | — | — |
| 1985 | 34° | 4° | 19° | — | — |
| 1984 | 40° | 7° | 23° | — | — |
| 1983 | 31° | 21° | 26° | — | — |
| 1982 | 39° | 12° | 26° | — | — |
| 1981 | 43° | 28° | 35° | — | — |
| 1980warmest | 68° | 28° | 48° | — | — |
| 1979 | 62° | 28° | 45° | — | — |
| 1978 | 45° | 17° | 31° | — | — |
| 1977 | 56° | 32° | 44° | — | — |
| 1976 | 51° | 19° | 35° | — | — |
| 1975 | 51° | 1° | 26° | — | — |
| 1974 | 40° | 19° | 29° | — | — |
| 1973 | 45° | 22° | 33° | — | — |
| 1972 | 27° | -7° | 10° | — | — |
| 1971 | 38° | 11° | 24° | — | — |
55 years of data from FT COLLINS