Today, the mortgage interest rate on a 30-year fixed mortgage is 6.85%, according to the Mortgage Research Center, while the average rate on a 15-year mortgage is 5.86%. On a 30-year jumbo mortgage, the average rate is 7.

Rates on 15-year new purchase loans fell even more significantly last week, plunging 16 basis points to average 5.98% Friday. Like 30-year loans, 15-year rates sank to a two-year low in September, dropping as far as 4.97% (though the lowest Friday weekly average was 5.07%).

Mortgage rates fluctuate daily, so a little volatility can always be expected. On Monday, the average rate on a 30-year fixed mortgage was around 6.96%, according to Bankrate data, which is 0.15% lower than January's peak of 7.11%. But February could see more turbulence than usual.