Rates on 30-year mortgages edged up for a fourth straight week, rising to the highest level in two months, Freddie Mac reported Thursday.

The giant mortgage company said its nationwide survey showed that rates on 30-year mortgages rose to 6.28 percent, up from 6.24 percent last week.

It was the fourth consecutive increase and left the 30-year mortgage at the highest level since it stood at 6.30 percent the week of Dec. 15. Rates on 30-year mortgages had dropped as low as 6.10 percent in mid-January before beginning their latest increase.

Rates on 15-year, fixed-rate mortgages, a popular choice for refinancing a home mortgage, averaged 5.91 percent this week, up from 5.83 percent last week.