The highest day temperature in December 2025 was 40°F. The lowest night temperature was -20°F. The average values for day and night temperatures during December were 17.3°F и 7.6°F respectivly.

You can expect various weather conditions during December. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in December for Bismarck is 0.2 in.

The average wind speed in December is 8.5 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Bismarck in December is 4.1 hours.