December weather in Johnstown, PA
The average temperature in Johnstown in December is 31.2°F (24.6°F–37.8°F). Average precipitation: 2.68 inches.
December is a winter month in Johnstown, and is cooler than the annual average of 48.9°F. Daily temperatures swing about 13.2°F between overnight low and afternoon high. Expect about 15 days with precipitation. Daylight averages about 9h 8m. For travel, December is cold.
Avg High
37.8°F
Avg Low
24.6°F
Precipitation
2.68 in
Daylight
9h 8m
December records in Johnstown
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 66.0°F (2006) | 17.1°F (2002) | 0.81 in (2010) |
| December 2 | 61.0°F (2018) | 14.0°F (2000) | 0.68 in (2007) |
| December 3 | 59.0°F (2001) | 5.0°F (2002) | 0.48 in (2022) |
| December 4 | 64.0°F (2012) | 5.0°F (2002) | 0.22 in (2012) |
| December 5 | 71.1°F (2001) | 8.1°F (2025) | 0.49 in (2002) |
| December 6 | 61.0°F (2001) | 8.1°F (2000) | 0.73 in (2013) |
| December 7 | 62.1°F (2022) | 9.1°F (2008) | 0.96 in (2011) |
| December 8 | 57.9°F (2023) | 7.0°F (2005) | 0.41 in (2001) |
| December 9 | 57.9°F (2023) | 7.0°F (2002) | 0.79 in (2009) |
| December 10 | 57.0°F (2024) | 11.1°F (2009) | 0.66 in (2003) |
| December 11 | 62.1°F (2007) | 10.2°F (2009) | 0.80 in (2008) |
| December 12 | 64.0°F (2015) | 9.1°F (2013) | 0.51 in (2016) |
| December 13 | 62.1°F (2015) | 3.9°F (2005) | 0.92 in (2007) |
| December 14 | 63.0°F (2015) | 6.1°F (2005) | 0.53 in (2019) |
| December 15 | 55.9°F (2008) | 3.2°F (2016) | 0.71 in (2018) |
| December 16 | 64.0°F (2021) | 2.1°F (2016) | 0.64 in (2014) |
| December 17 | 57.9°F (2006) | 10.9°F (2000) | 0.90 in (2016) |
| December 18 | 57.9°F (2006) | 8.1°F (2000) | 1.05 in (2016) |
| December 19 | 48.9°F (2002) | -0.9°F (2004) | 1.97 in (2008) |
| December 20 | 51.1°F (2013) | -2.9°F (2004) | 0.62 in (2012) |
| December 21 | 59.0°F (2013) | 2.1°F (2008) | 0.72 in (2018) |
| December 22 | 62.1°F (2013) | -0.9°F (2000) | 0.74 in (2022) |
| December 23 | 57.9°F (2015) | -7.8°F (2022) | 0.57 in (2007) |
| December 24 | 59.0°F (2015) | -7.8°F (2022) | 1.85 in (2008) |
| December 25 | 57.9°F (2015) | 5.0°F (2004) | 0.85 in (2021) |
| December 26 | 57.0°F (2019) | 5.0°F (2000) | 0.93 in (2025) |
| December 27 | 66.0°F (2015) | 2.1°F (2017) | 1.01 in (2021) |
| December 28 | 61.0°F (2008) | 0.1°F (2017) | 0.43 in (2018) |
| December 29 | 60.1°F (2025) | 2.1°F (2017) | 0.83 in (2013) |
| December 30 | 61.0°F (2022) | 6.3°F (2017) | 0.27 in (2003) |
| December 31 | 57.0°F (2018) | 1.2°F (2017) | 0.87 in (2018) |