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Insulation in Helena: July highs average about 78°F; January lows average about 16°F.
In Lewis and Clark County, July highs average about 78°F and January lows about 16°F, with roughly 22 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 Lewis and Clark County, with hail up to 1.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Lewis and Clark County has had 11 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Horse Gulch Fire (2024).
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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.
East Helena · Boulder · Townsend · Deer Lodge · Walkerville · Cascade · Whitehall · White Sulphur Springs