Climate almanac
Ontario
Oregon, United States · 44.03°, -116.96°
What is the weather like in Ontario in December?
In December, Ontario is typically 41°F (5°C) during the day and 28°F (-2°C) at night. The month brings about 1.8 in (46 mm) of precipitation in total. Snowfall averages about 4.1 in (105 mm) over the month.
- Average high41°F (5°C)
- Average low28°F (-2°C)
- Precipitation1.8 in (46 mm)
- Clear or mostly clear days6
- Snowfall4.1 in (105 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)