Foster County Climate
Foster County, North Dakota
Avg Annual Temp
40.3°F
Annual Precip
21.0"
Annual Snowfall
59.8"
Extreme Heat Days
7.866666666666667
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Foster County Weather
A Snow-Heavy Continental Climate
Foster County averages 40.3°F, which is far below the 55°F national median. It is characterized by a harsh continental climate and significant annual snowfall.
Colder and Much Snowier
At 40.3°F, Foster is slightly cooler than the state average. It stands out for its 59.8 inches of annual snowfall, which is nearly 20 inches higher than many other counties.
Leader in Regional Snowfall
Foster is much snowier than nearby Cass or Dickey, receiving nearly 17 more inches of snow than Cass annually. Its 8.2°F January average makes it one of the colder spots in central North Dakota.
Mild Summers and Long Winters
Summer is brief and mild with only 8 days of extreme heat. Winter dominates the year, featuring a 11.5°F seasonal average and nearly 60 inches of total snow.
Heavy Snow Equipment Needed
Invest in professional-grade snow removal tools to handle the 59.8 inches of annual snowfall. Winterize homes early to withstand the long periods of 11.5°F winter weather.
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.