Climate almanac
Castle Shannon
Pennsylvania, United States · 40.36°, -80.02°
What is the weather like in Castle Shannon in December?
In December, Castle Shannon is typically 43°F (6°C) during the day and 31°F (-1°C) at night. The month brings about 3.9 in (99 mm) of precipitation in total. Snowfall averages about 4.5 in (115 mm) over the month.
- Average high43°F (6°C)
- Average low31°F (-1°C)
- Precipitation3.9 in (99 mm)
- Clear or mostly clear days3
- Snowfall4.5 in (115 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)