WASHINGTON — Nonfarm U.S. payrolls increased by a disappointing 36,000 in January as the unemployment rate dropped to 9.0%, the lowest level since April 2009, and severe winter weather affected employment in some sectors, the Labor Department reported Friday.

Private payrolls added 50,000 workers for the month, following gains of 139,000 and 128,000 in December and November, respectively.

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