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Insulation in Lima: July highs average about 75°F; January lows average about 12°F.
In Beaverhead County, July highs average about 75°F and January lows about 12°F, with roughly 20 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 Beaverhead County, with hail up to 1.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Beaverhead County has had 4 federal disaster declarations in the last 25 years, most often for public-health emergencies; the latest was Sand Creek Fire (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 Beaverhead County figures — more about homes in Dillon.
Dillon · Virginia City · Sheridan · Twin Bridges · Ennis · West Yellowstone · Whitehall · Walkerville