The average long-term U.S. mortgage rate ticked up again this week, remaining at its highest level since July.

The uptick in the cost of home loans reflects a rise in the bond yields that lenders use as a guide to price mortgages, specifically the yield on the US 10-year Treasury. The yield on the 10-year Treasury has climbed from 3.62 percent in mid-September to 4.66% this week.

U.S. mortgage rates are back at their highest level since last summer, frustrating homebuyers waiting for a break from some of the steepest borrowing costs in more than a decade.

Mortgage interest rates pulled back a little this week, but it was hardly enough to erase the past three weeks' gains. The week ending Jan. 9, the average rate on the 30-year fixed-rate mortgage fell four basis points to 6.93%, according to rates provided to NerdWallet by Zillow. A basis point is one-one hundredth of a percentage point.

The average long-term US mortgage rate ticked up again this week, remaining at its highest level since July. The benchmark 30-year fixed rate loan rate rose to 6.93% from 6.91% last week, according to mortgage giant Freddie Mac.