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Insulation in Seneca: July highs average about 82°F; January lows average about 21°F.
In Grant County, July highs average about 82°F and January lows about 21°F, with roughly 21 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, floods and damaging thunderstorm winds in Grant County, with hail up to 2 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Grant County has had 12 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Wildfires (2025).
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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 Grant County figures — more about homes in John Day.
Canyon City · John Day · Mount Vernon · Prairie City · Dayville · Burns · Hines · Long Creek