Brookings County Climate
Brookings County, South Dakota
Avg Annual Temp
42.8°F
Annual Precip
25.2"
Annual Snowfall
35.8"
Extreme Heat Days
7.25
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Brookings County Weather
A Cool and Damp Eastern Climate
Brookings County is significantly cooler than the national median, with an annual average of just 42.8°F. This area receives 25.2 inches of precipitation, making it one of the state's more humid regions.
Among the Coldest in South Dakota
The county averages nearly 3 degrees colder than the South Dakota average of 45.6°F. It ranks as one of the chilliest counties in the state, particularly during the deep winter months.
Fewer Heat Days Than Neighbors
Brookings experiences only 7 extreme heat days, far fewer than neighbor Beadle County's 22 days. However, its 25.2 inches of annual rain makes it wetter than much of the central plains.
Deep Freezes and Mild Summers
January is especially harsh with an average temperature of 12.3°F and 35.8 inches of annual snowfall. Summers are mild and pleasant, peaking at a July average of only 70.3°F.
Prioritize High-Efficiency Heating Systems
Homeowners must prioritize heavy insulation to combat the frigid 15.7°F winter average. While summer cooling needs are minimal, winter wardrobes require heavy gear for the long sub-freezing season.
Frequently Asked Questions
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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.