Climate almanac
St. Marys
Ontario, Canada · 43.25°, -81.13°
What is the weather like in St. Marys in December?
In December, St. Marys is typically 35°F (2°C) during the day and 25°F (-4°C) at night. The month brings about 3.5 in (88 mm) of precipitation in total. Snowfall averages about 12 in (300 mm) over the month.
- Average high35°F (2°C)
- Average low25°F (-4°C)
- Precipitation3.5 in (88 mm)
- Clear or mostly clear days1
- Snowfall12 in (300 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)