Rock County Climate
Rock County, Wisconsin
Avg Annual Temp
46.7°F
Annual Precip
37.9"
Annual Snowfall
36.7"
Extreme Heat Days
10.233333333333333
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Rock County Weather
A Southern Great Lakes Profile
Rock County averages 46.7°F annually, which is cooler than the national median but high for the Great Lakes. The climate is characterized by four distinct and robust seasons.
Among Wisconsin's Warmest Southern Tier
Positioned on the Illinois border, Rock is among Wisconsin's warmest counties, surpassing the state average of 44.4°F. It records some of the highest extreme heat counts in the state.
Wetter and Warmer Than Neighbors
With 37.9 inches of precipitation, Rock is slightly wetter than its eastern neighbor, Walworth County. It shares a southern-tier warmth that sets it apart from central Wisconsin.
Significant Heat and Moderate Snow
Heat is a major factor here, with 10 days per year reaching or exceeding 90°F. Winters are relatively dry compared to the north, seeing 36.7 inches of annual snow.
Ready for Summer Heat Waves
Residents should prepare for summer heat by maintaining efficient cooling systems. The 10 extreme heat days require community awareness and hydration planning for outdoor work.
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.