Climate almanac
South River
New Jersey, United States · 40.45°, -74.39°
What is the weather like in South River in December?
In December, South River is typically 45°F (7°C) during the day and 32°F (0°C) at night. The month brings about 4.1 in (104 mm) of precipitation in total. Snowfall averages about 3.2 in (80 mm) over the month.
- Average high45°F (7°C)
- Average low32°F (0°C)
- Precipitation4.1 in (104 mm)
- Clear or mostly clear days10
- Snowfall3.2 in (80 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)