Mortgage rates continue to fall this week with the average of a 30-year mortgage now below 4 percent, which is the lowest since June 2013. According to Freddie Mac, a 30-year fixed-rate mortgage reached 3.97 percent from 4.12 percent in the week ending October 16. A 15-year borrowing costs feel from 3.30 percent to 3.18 percent. Furthermore, a one-year adjustable-rate mortgage averaged at 2.38 percent from 2.42 percent. With such drop in average costs, long-term mortgage rates are seen to be following the 10-year United States Treasury rate, which were seen falling briefly below 2 percent this week. “Mortgage rates are at their lowest levels since June 2013 amidst continued investor skepticism regarding the precarious economic satiation in Europe,” said Frank Nothaft, chief economist at Freddie Mac’s.