The Conference Board said Thursday that its consumer confidence index fell this month to 65.1, down from 71.5 in November. That's the second straight decline and the lowest level since August.
The survey showed consumers are slightly more optimistic about current business conditions and hiring. But their outlook for the next six months deteriorated to its lowest level since 2011.
Lynn Franco, the board's director of economic indicators, said the decline in expectations for the next six months is a signal that consumers are worried about the "fiscal cliff." That's the name for the automatic spending cuts and tax hikes that take effect Jan. 1 if the White House and Congress can't reach a budget deal.
A separate survey released last week by the University of Michigan showed consumer confidence fell in December to a five-month low. And a report from MasterCard Advisors Spending pulse indicated holiday sales grew in the two months before Christmas at the weakest rate since 2008, when the country was in a deep recession.
The December drop in confidence "is obvious confirmation that a sudden and serious deterioration in hopes for the future took place in December -- presumably reflecting concern about imminent `fiscal cliff' tax increases," Pierre Ellis, economist with Decision Economics, wrote in a note to clients.
At one point, the Dow Jones industrial average fell as much as 150 points. But the market came back in the final hour of trading on a potential sign of movement in the talks. The Dow recouped nearly all of its losses to close down just 18 points at 13,096.