Breakfast bump: McDonald's US sales jump 5.7 percent

The world's biggest hamburger chain says the launch of an all-day breakfast menu and unseasonably warm weather helped lift sales by 5.7 percent in the U.S. for the final three months of the year.

McDonald's, which has more than 36,000 locations around the world, is working to turnaround its business under CEO Steve Easterbrook, who will mark one year on the job in March.

The changes come after McDonald's executives conceded they failed to keep up with changing tastes and saw sales slide.

The latest sales jump in the U.S. marks the best showing since the first quarter of 2012, when comparable-stores sales rose 8.9 percent.