December weather in Rock Springs, WY
The average temperature in Rock Springs in December is 22.8°F (12.4°F–33.2°F). Average precipitation: 0.52 inches. Average snowfall is 6.5 inches.
December is a winter month in Rock Springs, and is cooler than the annual average of 45°F. Daily temperatures swing about 20.8°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 8h 60m. For travel, December is cold.
Avg High
33.2°F
Avg Low
12.4°F
Precipitation
0.52 in
Snow
6.5 in
December records in Rock Springs
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 55.0°F (2021) | 3.9°F (2022) | 0.18 in (2007) |
| December 2 | 61.0°F (2021) | 1.0°F (2006) | 0.02 in (2020) |
| December 3 | 55.0°F (2021) | -2.0°F (2022) | 0.29 in (2013) |
| December 4 | 55.9°F (2021) | -0.9°F (2013) | 1.00 in (2011) |
| December 5 | 50.0°F (2021) | -20.0°F (2013) | 0.27 in (2019) |
| December 6 | 54.0°F (2023) | -17.0°F (2013) | 0.04 in (2005) |
| December 7 | 50.0°F (2008) | -23.1°F (2005) | 0.14 in (2007) |
| December 8 | 48.9°F (2014) | -20.0°F (2005) | 0.17 in (2003) |
| December 9 | 53.1°F (2015) | -6.0°F (2013) | 0.24 in (2021) |
| December 10 | 54.0°F (2015) | -2.0°F (2018) | 0.00 in (2003) |
| December 11 | 55.0°F (2017) | 3.0°F (2011) | 0.05 in (2020) |
| December 12 | 54.0°F (2017) | 1.9°F (2005) | 0.10 in (2022) |
| December 13 | 52.0°F (2025) | 1.9°F (2005) | 0.30 in (2016) |
| December 14 | 52.0°F (2025) | -4.0°F (2008) | 0.40 in (2015) |
| December 15 | 53.1°F (2006) | -9.0°F (2019) | 0.30 in (2015) |
| December 16 | 52.0°F (2025) | -6.0°F (2019) | 0.13 in (2016) |
| December 17 | 54.0°F (2025) | -5.1°F (2010) | 0.15 in (2006) |
| December 18 | 46.9°F (2013) | -9.0°F (2019) | 0.06 in (2005) |
| December 19 | 53.1°F (2025) | -7.1°F (2022) | 0.37 in (2010) |
| December 20 | 51.1°F (2017) | -4.0°F (2006) | 0.62 in (2010) |
| December 21 | 57.0°F (2025) | -6.0°F (2006) | 0.32 in (2010) |
| December 22 | 59.0°F (2025) | -16.1°F (2022) | 0.09 in (2015) |
| December 23 | 55.9°F (2025) | -17.0°F (2022) | 0.19 in (2017) |
| December 24 | 53.1°F (2025) | -0.9°F (2003) | 0.10 in (2023) |
| December 25 | 55.0°F (2025) | 6.1°F (2006) | 0.20 in (2014) |
| December 26 | 48.0°F (2025) | -7.1°F (2023) | 0.36 in (2003) |
| December 27 | 48.0°F (2025) | -18.9°F (2015) | 0.50 in (2024) |
| December 28 | 51.1°F (2005) | -20.0°F (2015) | 0.07 in (2014) |
| December 29 | 48.9°F (2008) | -20.0°F (2015) | 0.13 in (2020) |
| December 30 | 51.1°F (2011) | -20.0°F (2015) | 0.18 in (2010) |
| December 31 | 51.1°F (2025) | -26.0°F (2014) | 0.14 in (2022) |