Climate almanac
Johnston
Iowa, United States · 41.67°, -93.70°
What is the weather like in Johnston in December?
In December, Johnston is typically 38°F (4°C) during the day and 22°F (-5°C) at night. The month brings about 1.6 in (40 mm) of precipitation in total. Snowfall averages about 3.4 in (87 mm) over the month.
- Average high38°F (4°C)
- Average low22°F (-5°C)
- Precipitation1.6 in (40 mm)
- Clear or mostly clear days9
- Snowfall3.4 in (87 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)