With consumer spending making up two-thirds of economic activity in the U.S., the sales numbers indicate potentially weaker growth for the first quarter.

U.S. retail sales dropped by the most in nearly two years in January, likely because of frigid temperatures and moderation following hefty gains in the past four months, suggesting a sharp slowdown in economic growth early in the first quarter.

Sales plummeted 2.8% last month at auto dealers and slumped at furniture stores, home and garden centers. Even in the usually strong online retail sector saw a 1.9% decline. Sales rose at general merchandise stores, a category that includes big retailers like Walmart and Target, and at restaurants and bars.