December weather in Fort Collins, CO
The average temperature in Fort Collins in December is 31.1°F (18.3°F–44.0°F). Average precipitation: 0.47 inches. Average snowfall is 7.5 inches.
December is a winter month in Fort Collins, and is cooler than the annual average of 50.7°F. Daily temperatures swing about 25.7°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 9h 7m. For travel, December is cold.
Avg High
44.0°F
Avg Low
18.3°F
Precipitation
0.47 in
Snow
7.5 in
December records in Fort Collins
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 72.0°F (2021) | -5.1°F (1985) | 1.75 in (1913) |
| December 2 | 73.9°F (2021) | -5.1°F (1908) | 0.83 in (1933) |
| December 3 | 66.0°F (1948) | -7.1°F (1919) | 0.57 in (1901) |
| December 4 | 70.0°F (1980) | -15.0°F (1909) | 1.32 in (1913) |
| December 5 | 66.0°F (1939) | -18.9°F (1909) | 0.64 in (1913) |
| December 6 | 71.1°F (1939) | -18.0°F (1972) | 0.33 in (2009) |
| December 7 | 68.0°F (1984) | -18.0°F (1909) | 0.72 in (1988) |
| December 8 | 64.9°F (2015) | -16.1°F (1978) | 0.42 in (1926) |
| December 9 | 73.0°F (1957) | -35.0°F (1919) | 1.00 in (1985) |
| December 10 | 68.0°F (1933) | -23.1°F (1919) | 0.30 in (1963) |
| December 11 | 75.9°F (1939) | -23.1°F (1932) | 0.45 in (1938) |
| December 12 | 72.0°F (1921) | -29.9°F (1932) | 0.82 in (1958) |
| December 13 | 66.0°F (2010) | -18.9°F (1932) | 1.23 in (1925) |
| December 14 | 70.0°F (1924) | -31.0°F (1901) | 0.38 in (1902) |
| December 15 | 68.0°F (1980) | -18.0°F (1926) | 0.50 in (2015) |
| December 16 | 68.0°F (2025) | -18.0°F (1902) | 0.30 in (1908) |
| December 17 | 73.0°F (1980) | -15.0°F (1964) | 0.29 in (1975) |
| December 18 | 62.1°F (1979) | -13.0°F (1908) | 0.48 in (1973) |
| December 19 | 71.1°F (2025) | -23.1°F (1924) | 0.22 in (1913) |
| December 20 | 66.0°F (2024) | -20.9°F (1924) | 1.30 in (2006) |
| December 21 | 66.0°F (1896) | -16.1°F (1983) | 0.61 in (2006) |
| December 22 | 75.0°F (2025) | -24.0°F (1990) | 0.55 in (1941) |
| December 23 | 69.1°F (1933) | -16.1°F (1990) | 0.51 in (2009) |
| December 24 | 68.0°F (1955) | -29.9°F (1924) | 0.27 in (1982) |
| December 25 | 72.0°F (2025) | -18.9°F (1948) | 0.33 in (2014) |
| December 26 | 66.0°F (1947) | -14.1°F (1941) | 0.22 in (1922) |
| December 27 | 64.0°F (1947) | -16.1°F (1894) | 0.89 in (1979) |
| December 28 | 66.9°F (1917) | -24.0°F (1894) | 0.31 in (1979) |
| December 29 | 68.0°F (2017) | -9.9°F (1983) | 0.42 in (2006) |
| December 30 | 72.0°F (1980) | -14.1°F (1898) | 0.61 in (1947) |
| December 31 | 66.0°F (1904) | -22.0°F (1898) | 0.96 in (1975) |