Weather on December 18
Fort Collins, CO
55 Years of Data
About This Date
December 18th in Fort Collins, CO typically brings chilly winter weather, with average highs around 43°F and lows near 17°F — a 26°F daily swing. Over 55 years of records, the warmest December 18th was in 1979 (43°F average), while the coldest was 1983 (4°F) — a 39°F range across recorded history. Precipitation has occurred on 13% of recorded December 18th dates, with snow falling 15% of the time (heaviest snowfall: 5.9"). Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for December 18th in Fort Collins, CO? Bring layers as temperatures can vary throughout the day.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 49° | 33° | 41° | — | — |
| 2024 | 44° | 19° | 32° | — | — |
| 2023 | 51° | 20° | 35° | — | — |
| 2022 | 39° | 6° | 23° | — | — |
| 2021 | 35° | 8° | 22° | — | — |
| 2020 | 42° | 23° | 33° | — | — |
| 2019 | 50° | 10° | 30° | — | — |
| 2018 | 56° | 25° | 40° | — | — |
| 2017 | 54° | 19° | 36° | — | — |
| 2016 | 28° | -9° | 10° | — | — |
| 2015 | 40° | 5° | 22° | — | — |
| 2014 | 45° | 17° | 31° | — | — |
| 2013 | 56° | 29° | 42° | — | — |
| 2012 | 46° | 26° | 36° | 0.15" | 2.4" |
| 2011 | 55° | 17° | 36° | — | — |
| 2010 | 36° | 17° | 26° | — | — |
| 2009 | 47° | 26° | 36° | — | — |
| 2008 | 36° | 11° | 23° | — | — |
| 2007 | 42° | 17° | 30° | — | — |
| 2006 | 35° | 11° | 23° | — | — |
| 2005 | 18° | 7° | 12° | 0.03" | 0.2" |
| 2004 | 47° | 24° | 35° | — | — |
| 2003 | 45° | 21° | 33° | — | — |
| 2002 | 41° | 22° | 31° | — | — |
| 2001 | 43° | 23° | 33° | — | — |
| 2000 | 38° | 27° | 32° | 0.03" | 0.1" |
| 1999 | 52° | 19° | 35° | — | — |
| 1998 | 60° | 11° | 35° | 0.1" | 0.5" |
| 1997 | 54° | 22° | 38° | — | — |
| 1996 | 23° | 4° | 13° | — | — |
| 1995 | 36° | 22° | 29° | — | — |
| 1994 | 58° | 19° | 38° | — | — |
| 1993 | 38° | 10° | 24° | — | — |
| 1992 | 33° | 13° | 23° | 0.05" | 0.3" |
| 1991 | 32° | 15° | 24° | — | — |
| 1990 | 45° | 20° | 32° | — | — |
| 1989 | 20° | 1° | 10° | 0.41" | 2.4" |
| 1988 | 52° | 13° | 32° | — | — |
| 1987 | 39° | 18° | 28° | — | — |
| 1986 | 44° | 11° | 27° | — | — |
| 1985 | 42° | 23° | 33° | — | — |
| 1984 | 35° | 7° | 21° | — | — |
| 1983coldest | 10° | -2° | 4° | — | 0.3" |
| 1982 | 52° | 33° | 42° | — | — |
| 1981 | 35° | 6° | 21° | — | — |
| 1980 | 51° | 27° | 39° | — | — |
| 1979warmest | 62° | 23° | 43° | — | — |
| 1978 | 42° | 21° | 32° | — | — |
| 1977 | 52° | 20° | 36° | — | — |
| 1976 | 59° | 17° | 38° | — | — |
| 1975 | 38° | -5° | 16° | — | — |
| 1974 | 43° | 24° | 33° | — | — |
| 1973 | 41° | 20° | 30° | 1.22" | 5.9" |
| 1972 | 50° | 30° | 40° | — | — |
| 1971 | 44° | 19° | 32° | — | — |
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.