Average U.S. long-term mortgage rates fell for a second straight week, with the key 30-year rate slipping below 4 percent.

Average U.S. long-term mortgage rates fell for a second straight week, with the key 30-year rate slipping below 4 percent.

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 fixed3.98 percent4.04 percent4.23 percent3.59 percent15-year fixed3.17 percent3.21 percent3.37 percent2.92 percent5-year adjustable2.95 percent2.97 percent3.08 percent2.82 percent1-year adjustable2.52 percent2.54 percent2.59 percent2.35 percent