December weather in Harrisburg, PA
The average temperature in Harrisburg in December is 33.8°F (26.7°F–40.8°F). Average precipitation: 3.42 inches. Average snowfall is 4.2 inches.
December is a winter month in Harrisburg, and is cooler than the annual average of 51.9°F. Daily temperatures swing about 14.1°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 9h 8m. For travel, December is cold.
Avg High
40.8°F
Avg Low
26.7°F
Precipitation
3.42 in
Snow
4.2 in
December records in Harrisburg
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 66.0°F (2001) | 16.0°F (2013) | 0.94 in (2010) |
| December 2 | 72.0°F (2006) | 17.1°F (2024) | 0.54 in (2010) |
| December 3 | 62.1°F (2021) | 16.0°F (2002) | 0.72 in (2009) |
| December 4 | 63.0°F (2012) | 16.0°F (2002) | 0.28 in (2005) |
| December 5 | 66.9°F (2012) | 17.1°F (2002) | 0.38 in (2020) |
| December 6 | 69.1°F (2001) | 17.1°F (2007) | 0.70 in (2003) |
| December 7 | 64.9°F (2001) | 10.0°F (2002) | 0.93 in (2013) |
| December 8 | 57.0°F (2001) | 10.0°F (2002) | 1.04 in (2011) |
| December 9 | 55.0°F (2004) | 9.0°F (2025) | 1.27 in (2009) |
| December 10 | 53.1°F (1999) | 8.1°F (2025) | 0.61 in (2004) |
| December 11 | 54.0°F (2006) | 14.0°F (2005) | 1.97 in (2003) |
| December 12 | 61.0°F (2021) | 14.0°F (2005) | 2.22 in (2008) |
| December 13 | 57.9°F (2015) | 9.0°F (2005) | 0.27 in (2010) |
| December 14 | 64.0°F (2015) | 6.1°F (2005) | 1.10 in (2007) |
| December 15 | 64.0°F (2015) | 5.0°F (2005) | 1.20 in (1999) |
| December 16 | 60.1°F (2008) | 7.0°F (2025) | 1.70 in (2022) |
| December 17 | 60.1°F (2021) | 9.0°F (2025) | 1.90 in (2000) |
| December 18 | 55.0°F (2024) | 15.1°F (2002) | 2.21 in (2023) |
| December 19 | 63.0°F (2006) | 14.0°F (2020) | 0.71 in (2025) |
| December 20 | 55.0°F (2017) | 5.0°F (2004) | 1.12 in (2008) |
| December 21 | 60.1°F (2018) | 5.0°F (2004) | 1.35 in (2012) |
| December 22 | 66.9°F (2013) | 10.9°F (2008) | 0.47 in (2015) |
| December 23 | 63.0°F (2013) | 9.0°F (2024) | 2.20 in (2022) |
| December 24 | 63.0°F (2015) | 3.0°F (2022) | 0.83 in (2004) |
| December 25 | 66.9°F (2015) | 3.0°F (2022) | 1.80 in (2020) |
| December 26 | 59.0°F (2015) | 12.9°F (2022) | 0.70 in (2002) |
| December 27 | 48.9°F (2015) | 14.0°F (2004) | 0.80 in (2012) |
| December 28 | 55.9°F (2015) | 10.0°F (2017) | 0.90 in (2011) |
| December 29 | 60.1°F (2008) | 9.0°F (2017) | 0.90 in (2015) |
| December 30 | 62.1°F (2024) | 7.0°F (2017) | 0.82 in (2013) |
| December 31 | 59.0°F (2022) | 10.0°F (2017) | 0.52 in (2007) |