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.

U.S. retail sales fell more than expected in January, dropping a seasonally adjusted 0.9% from December to $723.9 billion, the Commerce Department said. Economists surveyed by The Wall Street Journal had expected a drop of 0.