Climate almanac
Grass Valley
California, United States · 39.22°, -121.06°
What is the weather like in Grass Valley in December?
In December, Grass Valley is typically 54°F (12°C) during the day and 38°F (3°C) at night. The month brings about 11 in (280 mm) of precipitation in total. Snowfall averages about 6.8 in (172 mm) over the month.
- Average high54°F (12°C)
- Average low38°F (3°C)
- Precipitation11 in (280 mm)
- Clear or mostly clear days9
- Snowfall6.8 in (172 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)