Natural Disaster Risk in Grafton

Natural Hazard Profile: Grafton, Wisconsin

Grafton, in Ozaukee County, is a city of approximately 18,982 residents situated in the Great Lakes region. Its humid continental climate brings long, cold winters with lake-effect snow and warm summers, and in particular severe blizzards and spring tornado outbreaks. These conditions collectively define the natural hazard environment that Grafton residents and property owners must navigate.

According to FEMA's National Risk Index, Grafton carries an overall risk score of 5.1/10, placing it in the moderate category. Coastal flooding is the dominant hazard, with storm surge from tropical systems and nor'easters capable of inundating low-lying shoreline areas well above normal tidal levels. The area also faces notable exposure to cold wave and hail.

Within Wisconsin, Grafton's risk is, near the 5.4/10 state average. Nationally, it ranks above the U.S. national average of 4.5/10. FEMA's analysis of Ozaukee County identifies coastal flood as the foremost hazard, followed by cold wave and hail. These rankings reflect the relative frequency and severity of each hazard type in the local environment.

With a moderate risk rating, Grafton residents are well-served by maintaining standard preparedness practices — an emergency supply kit, awareness of local hazard seasonality, and insurance that covers the top local risks. Periodic review of coverage for coastal flood is recommended.