Climate almanac
St. Thomas
Ontario, Canada · 42.77°, -81.18°
What is the weather like in St. Thomas in December?
In December, St. Thomas is typically 37°F (3°C) during the day and 29°F (-2°C) at night. The month brings about 3.4 in (87 mm) of precipitation in total. Snowfall averages about 7.9 in (200 mm) over the month.
- Average high37°F (3°C)
- Average low29°F (-2°C)
- Precipitation3.4 in (87 mm)
- Clear or mostly clear days1
- Snowfall7.9 in (200 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)