WASHINGTON—Industrial output was flat in October, as unusually warm weather depressed demand for home and office heating, but the U.S. manufacturing and mining sectors showed continued signs of stabilization.

Industrial production—a measure of output from America’s factories, power plants and mines—was unchanged on a seasonally adjusted basis in October from the prior month, the Federal Reserve said Wednesday. Economists surveyed by The Wall Street Journal had expected a 0.2% increase.

Production...