Potential homebuyers who've been looking forward to the spring selling season may be watching with trepidation as interest rates on mortgages tick higher. As of Thursday, the average rate for a 30-year fixed-rate mortgage with a conforming loan balance — that is, $832,750 or less — was 6.35%, according to Mortgage News Daily . About two weeks earlier, ahead of the U.S. and Israel launching military strikes against Iran, it was 5.99%. "High oil prices are not good for mortgage rates," said