Mortgage bonds worsened last week, moving mortgage rates higher.
The Improving Market Index added 76 metropolitan areas in December as compared to the month prior.
The NAHB released its Improving Market Index for November 2012. The index is up four-fold in just 12 months.
The number of U.S. metropolitan area showing "measurable and sustained growth" climbed to 103 this month.
The number of U.S. housing markets showing "measurable and sustained growth" has increased by 19 this month, according to the National Association of Homebuilders' Improving Market Index.