According to the Standard & Poors Case-Shiller Index, home values rose 5 percent in June versus the month prior, and 4 percent from a year earlier.  It’s the 16th consecutive month in which Case-Shiller reported an increase in home values and the third straight month of outstanding results.

That said, homeowners and home buyers in Austin would do well to temper Case-Shiller enthusiasm. The June figures are issued on 60-day delay and, over the last 60 days, housing data has been lackluster at best.

• Existing Home Sales are down 27 percent
• New Home Sales are down 12 percent
• Homebuilder confidence is down

Stories like these highlight a key weakness of the Case-Shiller Index — it’s out of date as soon as it’s published. Because of this, the Case-Shiller Index relevance to everyday Americans is muted. People don’t buy homes in the “60 days ago” real estate market, after all.

June is ancient real estate history to buyers and sellers in Plano.

However, the Case-Shiller Index does have its place. As the most widely-followed, private-sector housing tracker, the index is used to help make policy decisions and to shape Wall Street’s expectations of the economy. This means that a strong Case-Shiller reading can cause mortgage rates to rise, and a weak Case-Shiller reading can cause rates to fall.

Tuesday, mortgage rates fell.

Standard & Poors released its Case-Shiller Index Tuesday. On a seasonally-adjusted basis, between April and May 2010, home prices rose in 19 of Case-Shiller’s 20 tracked markets.  It’s the second straight month of strong Case-Shiller findings.

Also, May’s numbers are a mirror-image of February’s. In February, 19 of 20 markets lost value.

In its press release, the Case-Shiller staff resisted calling May’s data proof of a housing recovery, noting that home values remain flat as compared to October of last year. However, there are some noteworthy numbers in the Case-Shiller report.

1. 13 of the 20 tracked cities are showing home price improvement year-over-year
2. Foreclosure posterchlld San Diego has now shown 13 straight months of improvement
3. San Diego, San Francisco and Minneapolis are showing double-digit annual growth

These are all good signs for the housing market, but the Case-Shiller Index is not without its flaws. Most notably, the data is limited to just 20 cities nationwide — and they’re not even the 20 largest ones. 

Cities like Houston, Philadelphia, and San Jose are excluded from Case-Shiller, while cities like Tampa (#54) are not.

Another Case-Shiller flaw is that it reports on a 2-month delay.

Therefore, today is several days from the start of August but we’re now reflecting on data from May. Given the speed at which the Austin real estate market can change, May’s data is almost ancient.  Today’s values may be higher or lower than what Case-Shiller reports.

For home buyers, reports like the Case-Shiller Index may not be useful in making a “Buy or Not Buy” decision, but can aid in watching longer-term trends in housing.  For real-time data, talk to a real estate agent with access to local figures instead.