December weather in Boulder, UT
The average temperature in Boulder in December is 30.2°F (21.1°F–39.3°F). Average precipitation: 0.79 inches. Average snowfall is 11.7 inches.
December is a winter month in Boulder, and is cooler than the annual average of 50.3°F. Daily temperatures swing about 18.2°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 9h 23m. For travel, December is cold.
Avg High
39.3°F
Avg Low
21.1°F
Precipitation
0.79 in
Snow
11.7 in
December records in Boulder
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 62.1°F (1995) | 6.1°F (1991) | 0.77 in (2007) |
| December 2 | 63.0°F (1995) | 10.9°F (1991) | 0.18 in (2018) |
| December 3 | 61.0°F (1977) | 8.1°F (2006) | 0.20 in (1982) |
| December 4 | 63.0°F (1958) | 5.0°F (2009) | 0.67 in (1983) |
| December 5 | 64.0°F (1995) | 1.9°F (2013) | 0.35 in (2019) |
| December 6 | 61.0°F (1995) | 3.9°F (1972) | 0.36 in (1986) |
| December 7 | 61.0°F (1958) | 1.0°F (1978) | 0.46 in (1966) |
| December 8 | 57.0°F (1962) | -11.0°F (1978) | 0.36 in (2009) |
| December 9 | 55.9°F (1958) | -0.9°F (1978) | 0.36 in (1965) |
| December 10 | 55.9°F (1995) | 0.0°F (1972) | 0.65 in (1965) |
| December 11 | 60.1°F (1988) | -0.9°F (1961) | 0.15 in (1963) |
| December 12 | 64.9°F (1958) | -5.1°F (1961) | 0.16 in (2011) |
| December 13 | 57.0°F (2017) | -4.0°F (1961) | 0.65 in (2009) |
| December 14 | 55.9°F (1988) | 0.0°F (1961) | 0.59 in (2009) |
| December 15 | 57.9°F (1980) | 3.9°F (1972) | 0.47 in (1967) |
| December 16 | 61.0°F (1980) | 3.9°F (1967) | 0.31 in (1965) |
| December 17 | 64.9°F (2025) | 5.0°F (1971) | 0.45 in (1978) |
| December 18 | 59.0°F (1998) | -2.0°F (1967) | 0.95 in (1978) |
| December 19 | 55.0°F (2025) | 6.1°F (1992) | 0.85 in (1967) |
| December 20 | 57.0°F (1958) | 3.0°F (1992) | 0.54 in (1984) |
| December 21 | 57.0°F (1969) | 1.0°F (1990) | 0.56 in (1988) |
| December 22 | 55.0°F (2014) | -6.0°F (1990) | 0.70 in (1965) |
| December 23 | 59.0°F (1964) | -11.0°F (1990) | 0.46 in (2010) |
| December 24 | 57.0°F (1964) | -9.9°F (1990) | 0.56 in (2019) |
| December 25 | 57.0°F (1980) | -2.0°F (1990) | 1.01 in (1959) |
| December 26 | 57.9°F (1980) | -4.0°F (1962) | 1.25 in (2003) |
| December 27 | 62.1°F (1963) | -6.0°F (2008) | 0.96 in (1984) |
| December 28 | 57.0°F (1980) | 1.0°F (1966) | 0.83 in (1992) |
| December 29 | 57.0°F (1980) | -4.0°F (1988) | 1.06 in (2004) |
| December 30 | 55.0°F (2017) | -6.0°F (1990) | 0.34 in (2010) |
| December 31 | 57.0°F (1980) | -0.9°F (1990) | 0.40 in (1959) |