Long-term U.S. mortgage rates are up for the fourth consecutive week, with the key 30-year rate reaching its highest level since May.
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Costs for would-be homebuyers continue to climb. Mortgage buyer Freddie Mac said Thursday that the average rate on 30-year, fixed-rate mortgages jumped to 4.65 percent, from 4.60 percent last week. The average rate has increased from 3.83 percent a year ago.
The average rate on 15-year, fixed-rate loans rose to 4.11 percent this week from 4.06 percent last week.
The primary factors driving rates higher include the strong economy, trade tensions between the U.S. and other countries, and the U.S. government stepping up sales of its debt, according to Freddie Mac chief economist Sam Khater.
The expanded U.S. debt sales suppress Treasury bond prices and push their interest rates higher. The yield on the key 10-year Treasury note has been running above 3 percent, approaching a seven-year high. The yield jumped to 3.08 percent Wednesday, from 2.96 percent a week earlier. It held at 3.08 percent Thursday morning.
The higher mortgage rates "represent continued affordability challenges for prospective buyers — especially first-time buyers," Khater said.
To calculate average mortgage rates, Freddie Mac surveys lenders across the country between Monday and Wednesday each week.
The average doesn't include extra fees, known as points, which most borrowers must pay to get the lowest rates.
The average fee on 30-year fixed-rate mortgages was unchanged from last week at 0.5 point. The fee on 15-year mortgages also remained at 0.5 point.
The average rate for five-year adjustable-rate mortgages edged down to 3.92 percent from 3.93 percent last week. The fee rose to 0.4 point from 0.3 point.