Interest.com's weekly survey of major lenders, taken March 17, found the average interest rate for a:

30-year, fixed-rate loan fell to 5.07% from 5.08%. A year ago, it was 5.29%.

15-year, fixed-rate loan rose to 4.45% from 4.43%. A year ago, it was 4.86%.

30-year, fixed-rate jumbo loan -- loans for more than $417,000 to $729,500, depending on the market -- felll to 5.88 from 5.92%. A year ago, it was 6.88%.

One-year, adjustable-rate loan rose to 4.84% from 4.83%. A year ago, it was 5.48%.

Five-year, adjustable-rate loan fell to 4.46% from 4.47%. A year ago, it was 5.24%.

Our database of mortgage rates can help you find the best deals in your area, including many that are less costly than these national averages.

Whether you're buying a home or refinancing an existing mortgage, we have a mortgage calculator that can help you make the right decisions.

By Carolyn Siegel

Interest.com Associate Editor