Average U.S. long-term mortgage rates were slightly lower to unchanged this week amid expectations that the Federal Reserve isn't ready yet to raise its key short-term interest rate.

Average U.S. long-term mortgage rates were slightly lower to unchanged this week amid expectations that the Federal Reserve isn't ready yet to raise its key short-term interest rate.

Here's a look at rates for fixed- and adjustable-rate mortgages this week and over the past year:

Current avg.Last week52-week high52-week low30-year fixed3.76 percent3.79 percent4.02 percent3.59 percent15-year fixed2.98 percent2.98 percent3.21 percent2.92 percent5-year adjustable2.89 percent2.89 percent3.02 percent2.82 percent1-year adjustable2.54 percent2.62 percent2.63 percent2.37 percent