Weather on December 31
Fort Collins, CO
55 Years of Data
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.
| 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° | — | — |
Fort Collins, CO Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Fort Collins, CO Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Fort Collins, CO Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Fort Collins, CO
Fort Collins, CO has no months that meet our "pleasant" threshold — every season has tradeoffs.