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Insulation in Spencer: July highs average about 80°F; January lows average about 5°F.
In Marathon County, July highs average about 80°F and January lows about 5°F, with roughly 33 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 hailstorms, damaging thunderstorm winds and tornadoes in Marathon County, with hail up to 3 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Marathon 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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Uneven rooms, high bills and an attic you can see the joists in are the signs; older homes often have far too little.
Attic insulation and air-sealing usually pay back fastest.
These are Marathon County figures — more about homes in Wausau.
Unity · Marshfield · Loyal · Colby · Stratford · Hewitt · Abbotsford · Granton