Immediately following the Brexit vote, U.S. Treasury yields plummeted to all-time lows. This week, markets stabilized and the 10-year Treasury yield rebounded sharply. In contrast, the 30-year mortgage rate declined after the Brexit vote, but only by half as much as the 10-year Treasury yield. This week, the 30-year fixed rate barely budged, rising just one basis point to 3.42 percent. This pattern suggests that mortgage rates are likely to remain low throughout the summer.