The average U.S. rate on the 30-year fixed mortgage was unchanged for a second week, remaining near historic lows. The average rate on the 15-year mortgage also stayed the same. Low mortgage rates are helping to strengthen the housing recovery.

Mortgage buyer Freddie Mac said Thursday that the rate on the 30-year low stayed at 3.53 percent. That’s near the 3.31 percent reached in November, which was the lowest on record going back to 1971.