Climate almanac
Cornwall
Ontario, Canada · 45.02°, -74.73°
What is the weather like in Cornwall in December?
In December, Cornwall is typically 32°F (0°C) during the day and 21°F (-6°C) at night. The month brings about 3.8 in (96 mm) of precipitation in total. Snowfall averages about 11 in (290 mm) over the month.
- Average high32°F (0°C)
- Average low21°F (-6°C)
- Precipitation3.8 in (96 mm)
- Clear or mostly clear days2
- Snowfall11 in (290 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)