Hamlin County Climate
Hamlin County, South Dakota
Avg Annual Temp
41.7°F
Annual Precip
25.0"
Annual Snowfall
40.9"
Extreme Heat Days
8.6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Hamlin County Weather
A Cold Climate with Low Extremes
Hamlin County is significantly colder than the national median, with an annual average temperature of just 41.7°F. This region experiences a true northern continental climate with very few days of extreme summer heat.
Well Below the State Average
With an annual average of 41.7°F, Hamlin is one of the coolest counties compared to the South Dakota average of 45.6°F. It remains wetter than the state average, recording 25.0 inches of precipitation annually.
Colder and Simpler than Neighbors
Hamlin is notably cooler than neighboring Grant County, which averages 44.0°F. While Grant sees 16 days of extreme heat, Hamlin averages only 9 days above 90°F, making it a local refuge from summer peaks.
Mild Summers and Long Cold Snaps
January is brutal with an average of 11.0°F, contributing to a substantial 40.9 inches of annual snowfall. Summers stay very mild, with a July average of 69.4°F and minimal extreme heat days.
Prioritize Insulation and Winter Mobility
Excellent home insulation is mandatory for the 14.3°F winter average. Because extreme heat is rare, residents can often rely on natural ventilation during the mild 67.2°F summer months.
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.