Lake County Climate
Lake County, South Dakota
Avg Annual Temp
44.9°F
Annual Precip
26.6"
Annual Snowfall
39.1"
Extreme Heat Days
11
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Lake County Weather
A Cool, Moist Continental Climate
Lake County averages 44.9°F annually, which is significantly cooler than the U.S. national median of 55°F. The county features a humid continental climate with four distinct and powerful seasons. Its proximity to numerous glacial lakes provides a slight local moderating effect on temperatures.
Wet and Cool Relative to South Dakota
Lake County receives 26.6 inches of precipitation annually, far exceeding the state average of 22.7 inches. Its annual average temperature of 44.9°F is slightly cooler than the South Dakota average of 45.6°F. This makes it one of the lushest and most moisture-rich counties in the state.
Higher Precipitation than Western Neighbors
Lake County is notably wetter than the central and western parts of the state, receiving about 7 more inches of rain/snow than Jackson County. Its summer is mild, with only 11 days of extreme heat compared to the state's hotter regions. Winter temperatures are chilly, with a December-February average of 18.0°F.
Moderate Summers and Snowy Winters
The county enjoys mild summers where July temperatures average 71.9°F with only 11 days over 90°F. Winter brings a steady cold, with January averaging 14.8°F and 39.1 inches of snow falling annually. This balance supports the region's vibrant aquatic and agricultural ecosystems.
Prepare for Moisture and Winter Frost
With 26.6 inches of precipitation, residents should ensure proper basement waterproofing and drainage systems. Heating systems need to be robust to handle the 14.8°F January average. Summer is the ideal time for outdoor work, as extreme heat rarely persists for more than 11 days.
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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.