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What Is a Seasonally Adjusted House Price Index? The Same Month, Two Different Numbers

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Did U.S. home prices rise or fall in August 2026? The answer depends on which version of the same index you read. The unadjusted Case-Shiller National Index fell 0.2% from July. The seasonally adjusted version rose 0.3%. Both numbers describe the same homes in the same month. The gap between them is seasonal adjustment: a statistical step that strips out the part of the monthly move that happens every year, so what is left shows whether prices actually gained or lost ground. All figures below come from the releases published on October 27, 2026, unless noted. Here is how the adjustment works, where it shows up in the four most-quoted price measures, and which version to read for the question you are asking. Why House Prices Have a Season Every year, the housing market runs the same calendar — and prices follow it. Spring and summer bring more buyers: families move between school years, daylight lasts longer, and weather makes showings and moves easier. Winter brings fewer listings...

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