Climate almanac
Saint Marys
Pennsylvania, United States · 41.43°, -78.56°
What is the weather like in Saint Marys in December?
In December, Saint Marys is typically 37°F (3°C) during the day and 25°F (-4°C) at night. The month brings about 3.8 in (96 mm) of precipitation in total. Snowfall averages about 10 in (256 mm) over the month.
- Average high37°F (3°C)
- Average low25°F (-4°C)
- Precipitation3.8 in (96 mm)
- Clear or mostly clear days2
- Snowfall10 in (256 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)