Weather on December 31
Fort Collins, CO
55 Years of Data
Avg High
40°F
Avg Low
15°F
Warmest
1980
42°F avg
Coldest
1978
0°F avg
About This Date
December 31st in Fort Collins, CO typically brings chilly winter weather, with average highs around 40°F and lows near 15°F — a 25°F daily swing. Over 55 years of records, the warmest December 31st was in 1980 (42°F average), while the coldest was 1978 (0°F) — a 42°F range across recorded history. Precipitation has occurred on 18% of recorded December 31st dates, with snow falling 16% of the time (heaviest snowfall: 11.2"). The last decade has been 5.6°F cooler on this date compared to 20-30 years ago.
The last decade has been 5.6°F cooler on this date compared to 20-30 years ago.
Planning for December 31st in Fort Collins, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 63° | 21° | 42° | — | — |
| 2024 | 37° | 20° | 28° | — | — |
| 2023 | 45° | 21° | 33° | — | — |
| 2022 | 48° | 20° | 34° | — | — |
| 2021 | 35° | 16° | 25° | 1.24" | 6.5" |
| 2020 | 45° | 14° | 29° | — | — |
| 2019 | 42° | 7° | 24° | — | — |
| 2018 | 40° | 9° | 24° | 0.03" | 0.3" |
| 2017 | 31° | 11° | 21° | 0.23" | 2.9" |
| 2016 | 40° | 20° | 30° | — | — |
| 2015 | 30° | 10° | 20° | — | — |
| 2014 | 31° | -16° | 7° | — | — |
| 2013 | 57° | 23° | 40° | — | — |
| 2012 | 27° | 13° | 20° | — | — |
| 2011 | 54° | 28° | 41° | — | — |
| 2010 | 15° | 5° | 10° | 0.13" | 0.6" |
| 2009 | 38° | 9° | 23° | — | — |
| 2008 | 34° | 16° | 25° | — | — |
| 2007 | 31° | 20° | 25° | — | — |
| 2006 | 42° | 10° | 26° | — | — |
| 2005 | 59° | 24° | 42° | — | — |
| 2004 | 50° | 23° | 37° | — | — |
| 2003 | 47° | 21° | 34° | — | — |
| 2002 | 51° | 19° | 35° | — | — |
| 2001 | 36° | 10° | 23° | — | — |
| 2000 | 32° | 22° | 27° | 0.41" | 2.6" |
| 1999 | 55° | 20° | 37° | — | — |
| 1998 | 39° | 26° | 33° | — | — |
| 1997 | 55° | 19° | 37° | — | — |
| 1996 | 57° | 25° | 41° | — | — |
| 1995 | 47° | 26° | 36° | — | — |
| 1994 | 24° | 9° | 16° | 0.43" | 4.7" |
| 1993 | 49° | 22° | 35° | — | — |
| 1992 | 32° | 13° | 22° | 0.03" | 0.1" |
| 1991 | 42° | 17° | 30° | — | — |
| 1990 | 42° | 6° | 24° | — | — |
| 1989 | 39° | 12° | 26° | — | — |
| 1988 | 44° | 10° | 27° | — | — |
| 1987 | 21° | -3° | 9° | — | — |
| 1986 | 43° | 18° | 30° | — | — |
| 1985 | 36° | 15° | 25° | — | — |
| 1984 | 42° | 25° | 33° | — | — |
| 1983 | 47° | 24° | 35° | 0.3" | — |
| 1982 | 39° | 9° | 24° | — | — |
| 1981 | 41° | 21° | 31° | — | — |
| 1980warmest | 56° | 29° | 42° | — | — |
| 1979 | 37° | 7° | 22° | — | — |
| 1978coldest | 12° | -12° | 0° | — | — |
| 1977 | 37° | 15° | 26° | — | — |
| 1976 | 25° | -2° | 11° | — | — |
| 1975 | 37° | 16° | 26° | 2.44" | 11.2" |
| 1974 | 34° | 19° | 26° | — | — |
| 1973 | 13° | 0° | 6° | 0.33" | 0.8" |
| 1972 | 31° | 9° | 20° | — | — |
| 1971 | 50° | 7° | 28° | — | — |
55 years of data from FT COLLINS