Rock County Climate
Rock County, Wisconsin
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
46.7°F
Annual Precip
37.9"
Annual Snowfall
36.7"
Extreme Heat Days
10
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
2,633
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Rock County
Climate Verdict
Rock County has a cool, averaging 46.7°F annually, moderate rainfall of 37.9 inches per year, rare extreme heat with only 10.233333333333333 days above 90°F annually, moderate snowfall of 36.7 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 18.9°F. summers are warm — July averages 71.2°F. Residents experience a substantial 52°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Rock County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Rock County closely matches the Wisconsin statewide average temperature of 44.4°F, it is somewhat wetter than average for Wisconsin.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.