Aug 8, 2014 17:41 Average U.S. 30-year mortgage rate at 4.14 percent Average U.S. 30-year mortgage rate at 4.14 percent FILE - This May 14, 2014 file photo shows a new home for sale in the Winthrop subdivision in Riverview, Fla. Freddie Mac reports on average U.S. mortgage rates for this week on Thursday, Aug. 7, 2014. (AP Photo/Chris O'Meara, File) The Associated Press Aug. 08, 2014 Comments WASHINGTON — Average long-term U.S. mortgage rates rose slightly this week but remained near their lows for the year. Mortgage company Freddie Mac says the nationwide average for a 30-year loan increased to 4.14 percent from 4.12 percent last week. The average for the 15-year mortgage, a popular choice for people who are refinancing, rose to 3.27 percent from 3.23 percent last week. Mortgage rates are below the levels of a year ago. They have fallen in recent weeks after climbing last summer when the Federal Reserve began talking about reducing the monthly bond purchases it was making to keep long-term borrowing rates low. The Fed issued a statement last week suggesting that it wants to see further improvement in the economy before it starts raising its key short-term interest rate.