Climate almanac
Thunder Bay
Ontario, Canada · 48.38°, -89.25°
What is the weather like in Thunder Bay in December?
In December, Thunder Bay is typically 23°F (-5°C) during the day and 11°F (-12°C) at night. The month brings about 2.2 in (55 mm) of precipitation in total. Snowfall averages about 13 in (335 mm) over the month.
- Average high23°F (-5°C)
- Average low11°F (-12°C)
- Precipitation2.2 in (55 mm)
- Clear or mostly clear days3
- Snowfall13 in (335 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)