December weather in Mount Vernon, SD
The average temperature in Mount Vernon in December is 23.0°F (14.1°F–31.9°F). Average precipitation: 0.49 inches.
December is a winter month in Mount Vernon, and is cooler than the annual average of 47.7°F. Daily temperatures swing about 17.8°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 8h 45m. For travel, December is cold.
Avg High
31.9°F
Avg Low
14.1°F
Precipitation
0.49 in
Daylight
8h 45m
December records in Mount Vernon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 66.0°F (2021) | -0.8°F (2014) | 0.35 in (2018) |
| December 2 | 62.1°F (2012) | 0.0°F (2025) | 0.25 in (2018) |
| December 3 | 59.0°F (2012) | -2.9°F (2025) | 0.17 in (2013) |
| December 4 | 53.1°F (2020) | -9.9°F (2005) | 0.21 in (2013) |
| December 5 | 55.9°F (2012) | -11.9°F (2005) | 0.10 in (2004) |
| December 6 | 64.9°F (2023) | -12.8°F (2013) | 0.28 in (2025) |
| December 7 | 64.9°F (2023) | -17.9°F (2013) | 0.11 in (2012) |
| December 8 | 55.0°F (2020) | -9.0°F (2005) | 0.26 in (2022) |
| December 9 | 61.0°F (2006) | -9.0°F (2005) | 0.15 in (2012) |
| December 10 | 55.0°F (2015) | -7.1°F (2000) | 0.72 in (2021) |
| December 11 | 51.1°F (2008) | -11.7°F (2013) | 0.18 in (2025) |
| December 12 | 53.1°F (2014) | -16.1°F (2000) | 0.04 in (2022) |
| December 13 | 59.0°F (2014) | -8.0°F (2000) | 0.63 in (2022) |
| December 14 | 55.9°F (2014) | -11.0°F (2025) | 0.17 in (2022) |
| December 15 | 53.1°F (2004) | -10.8°F (2008) | 0.87 in (2014) |
| December 16 | 52.0°F (2006) | -8.9°F (2008) | 0.37 in (2016) |
| December 17 | 52.0°F (2025) | -20.7°F (2016) | 0.07 in (2016) |
| December 18 | 60.1°F (2011) | -27.8°F (2016) | 0.16 in (2012) |
| December 19 | 48.0°F (2018) | -2.9°F (2000) | 0.04 in (2024) |
| December 20 | 51.1°F (2003) | -6.9°F (2022) | 0.53 in (2006) |
| December 21 | 48.9°F (2003) | -11.7°F (2022) | 0.20 in (2017) |
| December 22 | 62.1°F (2020) | -18.8°F (2022) | 0.03 in (2014) |
| December 23 | 52.0°F (2023) | -14.8°F (2013) | 0.44 in (2023) |
| December 24 | 51.1°F (2011) | -16.1°F (2000) | 0.47 in (2023) |
| December 25 | 55.9°F (1999) | -8.9°F (2017) | 0.52 in (2016) |
| December 26 | 57.0°F (2011) | -12.8°F (2017) | 0.45 in (2018) |
| December 27 | 53.1°F (2025) | -12.8°F (2017) | 0.69 in (2018) |
| December 28 | 57.0°F (2002) | -8.9°F (2015) | 0.16 in (2019) |
| December 29 | 60.1°F (1999) | -7.8°F (2014) | 1.02 in (2019) |
| December 30 | 61.0°F (2004) | -12.8°F (2014) | 0.27 in (2006) |
| December 31 | 55.9°F (1999) | -21.8°F (2017) | 0.09 in (2021) |