Home values fell again in January, according to the Federal Home Finance Agency’s Home Price Index. Values were reported down 0.6 percent, on average.

We say “on average” because the Home Price Index is a national report. It doesn’t capture the essence of a local market , or even a city market like Denver.

The most granular that the monthly Home Price Index gets is regional and January’s report shows that:

• Values in the Mountain states rose 2.0%
• Values in the Pacific states were flat
• Values in the East North Central states fell 1.8%

It’s hardly helpful for home buyers entering the market, or home sellers trying to properly price a home.  Furthermore, because the Home Price Index reports on a 2-month delay, its data fails to reflect the current market conditions.

Versus January — the period from which HPI data is collected — mortgage rates are lower, buyer activity is up, and the federal home buyer tax credit is closer to expiring.  These each can have an impact on housing.

Ultimately, national real estate data like the Home Price Index is best suited for lenders and policy-makers.  National data helps to identify trends that shape formal policy, but it doesn’t help you, specifically.

Since peaking in April 2007, the Home Price Index is off 13.2 percent.

Earlier this week, the private-sector Case-Shiller Index showed home prices slightly lower between November and December.  Thursday, the public-sector Home Price Index showed the same.

Publishing on a 2-month lag, the Federal Home Finance Agency said home prices fell by 1.6 percent nationally in December.  And that’s an average, of course.  Some regions performed well in December as compared to November, others didn’t.

• Values in the Middle Atlantic states improved slightly
• Values in New England were essentially unchanged
• Values in the Mountain states sagged, down 3.5%

These aren’t just footnotes. They’re an important piece toward understanding what national real estate statistics really mean. In short, “national statistics” are just a compilation of a bunch of local statistics.

For example, if we dig deeper into the FHFA Home Price Index 70-page report, we find that cities like Terre Haute, IN, Buffalo, NY, and Amarillo, TX posted year-over-year home price gains. You won’t see that in a “national” report.

Furthermore, it’s a sure bet that those same cities, you could find neighborhoods that are thriving, and others that are not.  Just because the city shows higher home values overall, it won’t necessarily be the case for every home in the city.

Every street in every neighborhood of every town in America has its own “local real estate market” and, in the end, that’s what should be most important to today’s buyers and sellers.  National data helps identify trends and shape government policy but, to the layperson, it’s somewhat irrelevant.

So, when you need to know whether your home in Littleton is gaining or losing value, you can’t look at the national data.  You have to look at your block — what’s selling and not selling — and start your valuations from there.