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 Oak Park 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.

Home prices ticked up 0.7% in November.  The Federal Housing Finance Agency tracks this data and, like Case-Shiller, it runs on a two-month delay.

That is perhaps the biggest issue.  The Realtor data shows 80% of Pending Home Sales close within 60 days meaning that the home price figures are always about a full sales cycle behind.

Over a year, the data can be fairly useful.  The facts are that home prices are up and home supplies are down over the past 12 month.

There are three main reasons to buy a home today:

1. First time home buyer tax credit
2. Home prices are low
3. Mortgage rates are low

We’re inside of 90 days on the expiration of the tax credit, we’re already seeing home prices move higher, and FHA interest rates are going to rise at the termination of the Fed’s purchase program.

Homes may not be this affordable for quite some time.