The CCFA said on Monday it expected French new car sales to be down by about 14 percent for 2012 as a whole.
In November, a total of 144,694 new cars were registered in France, the association said in a statement.
French car makers were among those that suffered the biggest drops, with sales by PSA Peugeot Citroen, the second-biggest European auto manufacturer, down by 22.9 percent, and those by the Renault group posting a plunge of 33.5 percent.
Foreign brands fared somewhat better, with a only a 7.9 percent decline overall.
South Korea's Hundayai-Kia posted a 20.5-percent gain in sales, followed by Daimler, which owns Mercedes-Benz and Smart, with a 13.8 percent increase.