The average rate on a 30-year mortgage in the U.S. rose for the second week in a row to its highest level since mid-July, reflecting a recent jump in the bond yields that lenders use as a guide to price home loans.The rate rose to 6.85% from 6.72% last week, mortgage buyer Freddie Mac said Thursday. One year ago, the rate on a 30-year mortgage averaged 6.61%.The average rate on a 30-year mortgage is now the highest its been since the week of July 11, when it was at 6.89%. It dipped as low as 6.08% in September a 2-year low and as high as 7.22% in May.Most economists forecast the average rate on a 30-year mortgage to remain above 6% next year, with some including an upper range as high as 6.8%. That range would be largely in line with where rates have hovered this year.Borrowing costs on 15-year fixed-rate mortgages, popular with homeowners seeking to refinance their home loan at a lower rate, also rose this week. The average rate increased to 6% from 5.92% last week. A year ago, it averaged 5.93%, Freddie Mac said.Elevated mortgage rates and rising home prices have kept homeownership out of reach of many would-be homebuyers. While sales of previously occupied U.S. homes rose in November for the second straight month, the housing market remains in a slump and on track for its worst year since 1995.Mortgage rates are influenced by several factors, including the moves in the yield on U.S. 10-year Treasury bonds.Bond yields climbed last week after the Federal Reserve signaled that it will likely deliver fewer cuts to rates next year than it forecast just a few months ago. While the central bank doesnt set mortgage rates, its actions and the trajectory of inflation influence the moves in the 10-year Treasury yield.The biggest wildcard for mortgage rates next year is whether President-elect Donald Trumps policy initiatives will contribute to higher inflation and swell the national debt, which could keep mortgage rates elevated. Thats because what happens with inflation, the U.S. deficit and the economy can have an effect on the 10-year Treasury yield.The yield, which was below 3.7% as recently as September, was at 4.61% in midday trading Thursday.Matt Ott, AP Business Writer