December weather in Alamosa, CO
The average temperature in Alamosa in December is 19.5°F (1.6°F–37.3°F). Average precipitation: 0.23 inches. Average snowfall is 4.2 inches.
December is a winter month in Alamosa, and is cooler than the annual average of 42.6°F. Daily temperatures swing about 35.7°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 9h 26m. For travel, December is cold.
Avg High
37.3°F
Avg Low
1.6°F
Precipitation
0.23 in
Snow
4.2 in
December records in Alamosa
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 57.0°F (2014) | -16.1°F (2006) | 0.28 in (2007) |
| December 2 | 61.0°F (2021) | -7.1°F (2006) | 0.08 in (2007) |
| December 3 | 61.0°F (2021) | -14.1°F (2006) | 0.07 in (2016) |
| December 4 | 63.0°F (2010) | -9.9°F (2009) | 0.12 in (2025) |
| December 5 | 55.9°F (2021) | -9.9°F (2005) | 0.06 in (2011) |
| December 6 | 55.9°F (2021) | -11.0°F (2005) | 0.02 in (2019) |
| December 7 | 55.0°F (2012) | -11.0°F (2011) | 0.00 in (2005) |
| December 8 | 55.9°F (2023) | -20.0°F (2005) | 0.03 in (2009) |
| December 9 | 55.0°F (2020) | -18.9°F (2005) | 0.16 in (2008) |
| December 10 | 52.0°F (2010) | -22.0°F (2012) | 0.20 in (2012) |
| December 11 | 57.0°F (2015) | -16.1°F (2012) | 0.10 in (2020) |
| December 12 | 54.0°F (2025) | -14.1°F (2012) | 0.06 in (2007) |
| December 13 | 55.0°F (2025) | -14.1°F (2012) | 0.12 in (2015) |
| December 14 | 54.0°F (2010) | -13.0°F (2007) | 0.27 in (2023) |
| December 15 | 54.0°F (2010) | -17.0°F (2007) | 0.21 in (2019) |
| December 16 | 61.0°F (2016) | -22.0°F (2007) | 0.04 in (2008) |
| December 17 | 53.1°F (2006) | -20.0°F (2007) | 0.20 in (2016) |
| December 18 | 55.0°F (2025) | -15.0°F (2007) | 0.02 in (2014) |
| December 19 | 51.1°F (2018) | -13.0°F (2016) | 0.11 in (2006) |
| December 20 | 61.0°F (2025) | -20.9°F (2012) | 0.06 in (2006) |
| December 21 | 59.0°F (2025) | -26.0°F (2012) | 0.20 in (2006) |
| December 22 | 57.0°F (2025) | -24.0°F (2012) | 0.31 in (2007) |
| December 23 | 59.0°F (2025) | -24.0°F (2012) | 0.35 in (2016) |
| December 24 | 53.1°F (2021) | -22.0°F (2007) | 0.11 in (2010) |
| December 25 | 62.1°F (2025) | -20.9°F (2007) | 0.20 in (2016) |
| December 26 | 59.0°F (2025) | -17.0°F (2007) | 0.05 in (2007) |
| December 27 | 57.0°F (2005) | -24.0°F (2007) | 0.02 in (2014) |
| December 28 | 52.0°F (2025) | -24.0°F (2007) | 0.23 in (2019) |
| December 29 | 52.0°F (2017) | -33.0°F (2007) | 0.14 in (2006) |
| December 30 | 57.0°F (2005) | -27.0°F (2007) | 0.00 in (2005) |
| December 31 | 63.0°F (2017) | -23.1°F (2007) | 0.03 in (2010) |