WASHINGTON — US consumers peering over the ‘‘fiscal cliff’’ don’t like what they see. The Conference Board said Thursday that its consumer confidence index fell for the second straight month, to 65.1, down from 71.5 in November.

The survey showed consumers’ outlook for the next six months deteriorated to its lowest since 2011 — a signal to Lynn Franco, the board’s director of economic indicators, that consumers are worried about tax hikes and spending cuts that take effect Jan. 1 if the White House and Congress can’t reach a budget deal.