Climate almanac
Johnstown
Colorado, United States · 40.34°, -104.91°
What is the weather like in Johnstown in December?
In December, Johnstown is typically 47°F (9°C) during the day and 24°F (-5°C) at night. The month brings about 0.7 in (19 mm) of precipitation in total. Snowfall averages about 3.9 in (100 mm) over the month.
- Average high47°F (9°C)
- Average low24°F (-5°C)
- Precipitation0.7 in (19 mm)
- Clear or mostly clear days15
- Snowfall3.9 in (100 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)