美国5月未季调住房通胀年率 3.9%，前值4%。

Group 1 - The core point of the article indicates that the year-on-year housing inflation rate in the United States for May is 3.9%, a decrease from the previous value of 4% [1] Group 2 - The article highlights the significance of housing inflation as a key economic indicator, reflecting trends in the real estate market and its impact on overall inflation [1] - The change in housing inflation rate may influence monetary policy decisions by the Federal Reserve, as it is closely monitored alongside other economic indicators [1] - The data suggests a potential easing in housing price pressures, which could have implications for consumer spending and economic growth [1]