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The numbers: The National Association of Home Builders' monthly confidence index tumbled four points to 56 in December.
What happened: The December decline took the sentiment index to the lowest since May 2015 and missed the Econoday forecast of a one-point increase. It followed a breathtaking plunge from October to November and brought the full-year 2018 average for the index to 67, one point lower than 2017.
In December, the index component measuring current sales conditions fell six points to 61, and the gauge of sales expectations over the next six months dropped four points, also to 61. The buyer traffic tracker fell two points to 43, its lowest level since March 2016.
Any reading over 50 signals improvement.
See: Toll Brothers orders tumble, but housing market comeback may be in the cards
Big picture: NAHB's index is often seen as an early read on new-home construction and sales. Indeed, the November sentiment plunge was followed by a new-home sales report that was the lowest in nearly three years.
Still, there are hints that green shoots may appear in the housing market in the new year. Consumer demand for purchase mortgages has been strong, and real estate agents have reported some post-Election Day bounces in traffic and interest.
Meanwhile, a team of analysts from BTIG visited builder sites in Florida in recent weeks, and came away "feeling better about the state of Florida housing than we expected," they wrote. "In general, most community salespeople noted softness over the last three months (more than seasonally) but pricing remains relatively firm and incentive offerings limited."
What they're saying: In a release, NAHB blamed rising mortgage rates and prices for the dismal state of builder sentiment. Mortgage rates actually slid to a three-month low in last week's update, though so far this year, the 30-year fixed has averaged 4.54%, up from 3.99% in 2017.
"We are hearing from builders that consumer demand exists, but that customers are hesitating to make a purchase because of rising home costs," the industry group said, adding that confidence was lowest in parts of the country where prices are highest. In the Northeast, for example, the index touched 37, the lowest since March 2015.
Market reaction: Share prices for the large publicly-traded builders have taken it on the chin this year. D.R. Horton, Inc.DHI, -0.56% shares are down about 30% for the year to date, about the same as the iShares U.S. Home ConstructionITB, -0.67% ETF.