Are you ready to upgrade your house this summer? With the sun showing up all day long, this is the best time to look out for a house. In addition to the favorable weather conditions after an unexpectedly harsh winter in 2015, mortgage interest rates are at their lowest level as compared to the last two years. According to Freddie Mac, mortgages were available at national average interest rates of 4.17% and 3.98% in 2014 and 2013, respectively. In March 2015, the average mortgage interest rate was 3.77% making it a favorable period for homebuyers.