December weather in Williamsport, PA
The average temperature in Williamsport in December is 32.7°F (25.7°F–39.8°F). Average precipitation: 3.26 inches. Average snowfall is 7.1 inches.
December is a winter month in Williamsport, and is cooler than the annual average of 51.8°F. Daily temperatures swing about 14.1°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 9h 2m. For travel, December is cold.
Avg High
39.8°F
Avg Low
25.7°F
Precipitation
3.26 in
Snow
7.1 in
December records in Williamsport
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 69.1°F (2006) | 17.1°F (2024) | 3.06 in (2010) |
| December 2 | 55.9°F (2021) | 18.0°F (2000) | 0.65 in (2015) |
| December 3 | 55.9°F (2009) | 10.0°F (2002) | 0.64 in (2023) |
| December 4 | 68.0°F (2012) | 10.9°F (2002) | 0.16 in (2005) |
| December 5 | 69.1°F (2001) | 12.0°F (2025) | 0.55 in (2017) |
| December 6 | 64.9°F (1999) | 10.9°F (2007) | 0.70 in (2014) |
| December 7 | 57.0°F (2001) | 6.1°F (2002) | 1.65 in (2011) |
| December 8 | 55.0°F (2004) | 12.0°F (2005) | 0.64 in (2001) |
| December 9 | 51.1°F (1999) | 6.1°F (2002) | 1.48 in (2009) |
| December 10 | 53.1°F (2006) | 9.0°F (2002) | 0.88 in (2023) |
| December 11 | 61.0°F (2021) | 10.9°F (2005) | 1.83 in (2003) |
| December 12 | 55.9°F (2006) | 15.1°F (2025) | 0.72 in (2010) |
| December 13 | 63.0°F (2015) | 5.0°F (2005) | 0.82 in (2007) |
| December 14 | 66.0°F (2015) | 0.0°F (2005) | 1.30 in (1999) |
| December 15 | 60.1°F (2015) | 10.0°F (2005) | 1.26 in (2022) |
| December 16 | 66.0°F (2021) | 8.1°F (2013) | 1.31 in (2018) |
| December 17 | 63.0°F (2021) | 9.0°F (2013) | 1.09 in (2020) |
| December 18 | 52.0°F (2006) | 10.9°F (2002) | 1.07 in (2016) |
| December 19 | 57.0°F (2025) | 3.9°F (2020) | 0.88 in (2008) |
| December 20 | 54.0°F (2002) | 0.0°F (2004) | 0.55 in (1999) |
| December 21 | 63.0°F (2018) | 9.0°F (2000) | 1.61 in (2018) |
| December 22 | 66.0°F (2013) | 6.1°F (2000) | 1.33 in (2022) |
| December 23 | 62.1°F (2015) | -2.9°F (2000) | 1.27 in (2004) |
| December 24 | 66.0°F (2015) | 1.0°F (2022) | 1.82 in (2020) |
| December 25 | 55.9°F (2014) | 12.0°F (2000) | 0.74 in (2002) |
| December 26 | 50.0°F (2014) | 10.0°F (2000) | 1.28 in (2012) |
| December 27 | 55.0°F (2015) | 7.0°F (2017) | 0.66 in (2023) |
| December 28 | 55.0°F (2008) | 7.0°F (2017) | 0.35 in (2018) |
| December 29 | 62.1°F (2024) | 7.0°F (2000) | 1.04 in (2013) |
| December 30 | 60.1°F (2024) | 10.0°F (2017) | 0.54 in (1997) |
| December 31 | 55.0°F (2022) | -0.9°F (2017) | 0.74 in (2018) |