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Insulation in Calimesa: July highs average about 101°F; January lows average about 42°F.
In Riverside County, July highs average about 101°F and January lows about 42°F, with roughly 8 inches of rain a year. That much heat keeps air conditioners running hard for months, so a yearly tune-up pays off.
Over the last 10 years the National Weather Service recorded flash floods, floods and damaging thunderstorm winds in Riverside County, with hail up to 1 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Riverside County has had 47 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Bain 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 Riverside County figures — more about homes in Riverside.
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