December weather in Northglenn, CO
The average temperature in Northglenn in December is 33.3°F (19.1°F–47.5°F). Average precipitation: 0.48 inches. Average snowfall is 5.9 inches.
December is a winter month in Northglenn, and is cooler than the annual average of 52.4°F. Daily temperatures swing about 28.4°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 9h 11m. For travel, December is cool.
Avg High
47.5°F
Avg Low
19.1°F
Precipitation
0.48 in
Snow
5.9 in
December records in Northglenn
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 75.0°F (1998) | -7.1°F (1985) | 0.27 in (2011) |
| December 2 | 73.0°F (1998) | 1.0°F (1985) | 0.40 in (2006) |
| December 3 | 77.0°F (2021) | -2.0°F (1985) | 0.32 in (1999) |
| December 4 | 69.1°F (1998) | 3.0°F (2009) | 0.23 in (2025) |
| December 5 | 77.0°F (2007) | -5.1°F (2013) | 0.10 in (2013) |
| December 6 | 71.1°F (2012) | -5.1°F (2013) | 0.09 in (2019) |
| December 7 | 73.9°F (2023) | -7.1°F (2005) | 0.30 in (1988) |
| December 8 | 73.9°F (2003) | -8.0°F (2005) | 0.35 in (1985) |
| December 9 | 69.1°F (1996) | -11.0°F (2009) | 0.32 in (1985) |
| December 10 | 68.0°F (2015) | -9.9°F (2009) | 0.39 in (1989) |
| December 11 | 69.1°F (1990) | -6.0°F (1985) | 0.16 in (2007) |
| December 12 | 69.1°F (2004) | -5.1°F (1985) | 0.08 in (1992) |
| December 13 | 71.1°F (2017) | -2.0°F (1985) | 0.30 in (2003) |
| December 14 | 66.9°F (2025) | -2.0°F (2008) | 0.23 in (1988) |
| December 15 | 73.0°F (2025) | -17.0°F (2008) | 0.16 in (1988) |
| December 16 | 73.0°F (2025) | -16.1°F (2008) | 0.22 in (1996) |
| December 17 | 70.0°F (2025) | -0.9°F (1996) | 0.60 in (2016) |
| December 18 | 72.0°F (2025) | -9.9°F (2016) | 0.03 in (1992) |
| December 19 | 68.0°F (2013) | -7.1°F (1989) | 0.09 in (1993) |
| December 20 | 73.9°F (2025) | -17.0°F (1990) | 0.12 in (1998) |
| December 21 | 71.1°F (2024) | -22.0°F (1990) | 1.49 in (2006) |
| December 22 | 69.1°F (2025) | -24.0°F (1990) | 0.64 in (2011) |
| December 23 | 82.0°F (2025) | -16.1°F (2022) | 0.18 in (2009) |
| December 24 | 66.9°F (2021) | -15.0°F (2022) | 0.30 in (2009) |
| December 25 | 75.0°F (2025) | -2.9°F (1987) | 1.20 in (2000) |
| December 26 | 75.0°F (2025) | -0.9°F (1988) | 0.50 in (2014) |
| December 27 | 68.0°F (2025) | -2.0°F (1988) | 0.52 in (1987) |
| December 28 | 66.9°F (2025) | -2.0°F (1990) | 0.24 in (2019) |
| December 29 | 68.0°F (1999) | -9.9°F (1990) | 1.28 in (2022) |
| December 30 | 66.0°F (2017) | -9.9°F (1990) | 0.19 in (2014) |
| December 31 | 69.1°F (2016) | -17.0°F (1987) | 0.26 in (2010) |