The U.S. dollar hit its highest in over five weeks against a basket of major currencies on Friday, a day after Federal Reserve Chair Janet Yellen said she expected the central bank to hike rates in 2015, and after U.S. growth data appeared to support such a move.

In a speech late Thursday, Fed Chair Janet Yellen, who spoke a week after the Fed delayed a long-anticipated rate hike, said she and other Fed policymakers do not expect recent global economic and financial market developments to significantly affect the central bank's policy.