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Insulation in Hollenberg: July highs average about 90°F; January lows average about 17°F.
In Washington County, July highs average about 90°F and January lows about 17°F, with roughly 31 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 tornadoes in Washington 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.
Washington County has had 16 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms, Straight-Line Winds, 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 Washington County figures — more about homes in Washington.
Hanover · Washington · Morrowville · Greenleaf · Haddam · Mahaska · Barnes · Oketo