Climate almanac
Herndon
Virginia, United States · 38.97°, -77.39°
What is the weather like in Herndon in December?
In December, Herndon is typically 47°F (9°C) during the day and 33°F (0°C) at night. The month brings about 3.7 in (95 mm) of precipitation in total. Snowfall averages about 1.4 in (37 mm) over the month.
- Average high47°F (9°C)
- Average low33°F (0°C)
- Precipitation3.7 in (95 mm)
- Clear or mostly clear days8
- Snowfall1.4 in (37 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)