December weather in Granby, CO
The average temperature in Granby in December is 17.9°F (7.8°F–28.0°F). Average precipitation: 0.82 inches.
December is a winter month in Granby, and is cooler than the annual average of 37.4°F. Daily temperatures swing about 20.2°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 9h 10m. For travel, December is cold.
Avg High
28.0°F
Avg Low
7.8°F
Precipitation
0.82 in
Daylight
9h 10m
December records in Granby
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 53.1°F (1998) | -8.0°F (2004) | 0.28 in (1950) |
| December 2 | 55.0°F (1972) | -15.0°F (1948) | 0.36 in (2023) |
| December 3 | 51.1°F (1998) | -9.9°F (2006) | 0.25 in (1953) |
| December 4 | 48.9°F (1998) | -11.9°F (1948) | 0.50 in (1954) |
| December 5 | 52.0°F (2012) | -17.0°F (2013) | 0.20 in (2019) |
| December 6 | 51.1°F (2003) | -23.1°F (1950) | 0.97 in (1966) |
| December 7 | 46.9°F (1981) | -22.0°F (1951) | 0.67 in (2007) |
| December 8 | 46.9°F (1996) | -31.0°F (1978) | 0.32 in (2019) |
| December 9 | 48.0°F (1981) | -29.9°F (1951) | 0.35 in (2004) |
| December 10 | 45.0°F (1975) | -23.1°F (1951) | 0.30 in (1982) |
| December 11 | 46.0°F (1995) | -18.0°F (1978) | 0.30 in (1948) |
| December 12 | 45.0°F (2025) | -11.9°F (1979) | 0.29 in (1958) |
| December 13 | 46.9°F (1948) | -24.0°F (1964) | 0.35 in (1971) |
| December 14 | 46.0°F (2025) | -18.9°F (1972) | 0.28 in (1951) |
| December 15 | 46.9°F (1962) | -27.0°F (1972) | 0.29 in (1988) |
| December 16 | 45.0°F (1962) | -18.0°F (1972) | 0.21 in (2008) |
| December 17 | 45.0°F (1962) | -17.0°F (2005) | 0.40 in (2016) |
| December 18 | 44.1°F (1980) | -22.0°F (1964) | 0.33 in (1992) |
| December 19 | 48.0°F (2025) | -14.1°F (1968) | 0.22 in (1988) |
| December 20 | 46.9°F (2025) | -27.0°F (1992) | 0.51 in (2006) |
| December 21 | 48.9°F (2025) | -22.0°F (1977) | 0.32 in (1960) |
| December 22 | 51.1°F (2025) | -27.9°F (1990) | 0.70 in (2001) |
| December 23 | 51.1°F (2025) | -35.0°F (1990) | 0.52 in (1948) |
| December 24 | 57.9°F (1971) | -33.0°F (1990) | 0.47 in (2021) |
| December 25 | 50.0°F (2025) | -29.0°F (1948) | 0.52 in (1983) |
| December 26 | 46.0°F (1980) | -24.0°F (1948) | 0.37 in (2017) |
| December 27 | 43.0°F (2006) | -20.9°F (2015) | 0.39 in (1983) |
| December 28 | 42.1°F (1965) | -27.9°F (1954) | 0.46 in (1964) |
| December 29 | 45.0°F (1965) | -36.9°F (1983) | 0.37 in (1951) |
| December 30 | 46.0°F (2017) | -27.9°F (1982) | 1.33 in (1951) |
| December 31 | 44.1°F (1980) | -22.0°F (2014) | 0.50 in (1951) |