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Generators in Sullivan: Jefferson County has seen damaging thunderstorm winds and hailstorms in the last 10 years, with hail up to 2.75 inches.
In Jefferson County, July highs average about 82°F and January lows about 12°F, with roughly 36 inches of rain a year. Long, cold winters put furnaces and pipes to the test.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and floods in Jefferson County, with hail up to 2.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Jefferson County has had 8 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms, Tornadoes, And Flooding (2026).
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Enough for the fridge, heating or cooling, lights and medical equipment; the pro sizes it from what you want running.
A standby generator starts on its own in an outage; portable is cheaper but has to be wheeled out and fuelled.
These are Jefferson County figures — more about homes in Watertown.
Dousman · Summit · Oconomowoc · Palmyra · Oconomowoc Lake · Johnson Creek · Lac La Belle · Jefferson