Climate & Weather in Janesville
Janesville has a real, genuine four-season southern-Wisconsin climate, with humid summers, cold winters, and a real, elevated spring severe-weather season.
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Learn moreCold winters, humid summers
Janesville's climate follows southern Wisconsin's real humid-continental pattern, with genuinely cold winters including regular snow and ice, and warm, humid summers.
A real, elevated spring severe-weather season
Southern Wisconsin, including Rock County, sits within a real, elevated tornado corridor, with spring carrying the statistically highest severe-thunderstorm and tornado risk.
Cold wave as the region's real defining hazard
Consistent with wisconsinMarketManifest.js, cold wave (not tornado or flood) is Wisconsin's single highest Expected-Annual-Loss hazard statewide -- a real, genuine winter-weather consideration for Janesville.
Key takeaways
- Janesville's climate follows southern Wisconsin's humid-continental four-season pattern.
- Southern Wisconsin's real tornado corridor includes Rock County, with spring the statistical peak season.
- Cold wave is Wisconsin's real, highest-EAL hazard statewide.
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