December weather in Signal Mountain, TN
The average temperature in Signal Mountain in December is 40.5°F (32.4°F–48.5°F). Average precipitation: 5.37 inches.
December is a winter month in Signal Mountain, and is cooler than the annual average of 57.4°F. Daily temperatures swing about 16.1°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 9h 39m. For travel, December is a wet month.
Avg High
48.5°F
Avg Low
32.4°F
Precipitation
5.37 in
Daylight
9h 39m
December records in Signal Mountain
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 66.0°F (1998) | 19.9°F (2002) | 1.88 in (2019) |
| December 2 | 62.1°F (2012) | 15.1°F (2006) | 2.40 in (2015) |
| December 3 | 68.0°F (2021) | 19.9°F (2002) | 1.42 in (2023) |
| December 4 | 69.1°F (2021) | 19.9°F (2002) | 1.40 in (2003) |
| December 5 | 66.9°F (1998) | 21.0°F (2008) | 1.40 in (2002) |
| December 6 | 72.0°F (1998) | 16.0°F (2024) | 1.80 in (2022) |
| December 7 | 68.0°F (1998) | 17.1°F (2024) | 2.09 in (2004) |
| December 8 | 69.1°F (1998) | 16.0°F (2010) | 1.05 in (1998) |
| December 9 | 63.0°F (2012) | 10.9°F (2006) | 2.96 in (2018) |
| December 10 | 66.9°F (2007) | 3.0°F (1995) | 2.00 in (2008) |
| December 11 | 71.1°F (2007) | 3.9°F (1995) | 2.60 in (2008) |
| December 12 | 73.0°F (2007) | 16.0°F (1995) | 0.90 in (2021) |
| December 13 | 68.0°F (2015) | 10.9°F (2010) | 1.12 in (1998) |
| December 14 | 68.0°F (2015) | 7.0°F (2010) | 1.71 in (2020) |
| December 15 | 62.1°F (2011) | 7.0°F (2010) | 2.05 in (2022) |
| December 16 | 64.9°F (2015) | 10.9°F (2025) | 0.65 in (2008) |
| December 17 | 66.0°F (2021) | 10.9°F (2025) | 1.00 in (2019) |
| December 18 | 66.0°F (2006) | 21.9°F (2007) | 1.16 in (2001) |
| December 19 | 69.1°F (2006) | 12.9°F (1996) | 1.51 in (2009) |
| December 20 | 60.1°F (2012) | 8.1°F (2000) | 1.55 in (2017) |
| December 21 | 62.1°F (2017) | 10.0°F (1996) | 0.81 in (2008) |
| December 22 | 64.0°F (2013) | 7.0°F (2008) | 0.90 in (2013) |
| December 23 | 64.0°F (2017) | -6.0°F (2022) | 2.20 in (2019) |
| December 24 | 66.0°F (2015) | -6.0°F (2022) | 2.40 in (2014) |
| December 25 | 59.0°F (2008) | 12.9°F (1999) | 1.81 in (2008) |
| December 26 | 69.1°F (2015) | 15.1°F (1999) | 1.87 in (1998) |
| December 27 | 70.0°F (2025) | 17.1°F (1995) | 0.95 in (2011) |
| December 28 | 70.0°F (2015) | 14.0°F (1995) | 1.00 in (2024) |
| December 29 | 66.0°F (2021) | 14.0°F (1995) | 1.73 in (2015) |
| December 30 | 64.9°F (2015) | 10.9°F (2000) | 0.71 in (2021) |
| December 31 | 61.0°F (2022) | 12.0°F (2000) | 1.35 in (2009) |