Climate almanac
Johnstown
Pennsylvania, United States · 40.33°, -78.92°
What is the weather like in Johnstown in December?
In December, Johnstown is typically 40°F (4°C) during the day and 27°F (-3°C) at night. The month brings about 4.3 in (108 mm) of precipitation in total. Snowfall averages about 8.5 in (215 mm) over the month.
- Average high40°F (4°C)
- Average low27°F (-3°C)
- Precipitation4.3 in (108 mm)
- Clear or mostly clear days3
- Snowfall8.5 in (215 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)