Rate includes only 30-Year Fixed Mortgage products, with and without points. This index is the Overnight National Average.You will see daily rate averages on Bankrate.com in boxes labeled overnight averages (these calculations are run after the close of the business day). Included there are rates we have collected on the previous day for a specific banking product. Overnight averages tend to be volatile. They help consumers see the movement of rates day to day. The institutions included in the overnight averages tables will be different from one day to the next, depending on which institutions' rates we gather on a particular day for presentation on the site.