As a professional climatologist, Brian Brettschneider thinks a lot about the weather. What does it mean to have "good weather"? One element, Brettschneider thinks, is a pleasant temperature of 70ºF.
If you'd like to spend an entire year at that temperature without making use of heating or air conditioning, then he's got the perfect road trip for you. On every day of this 9,125-mile journey, the average high is 70ºF. It takes you through 30 states of the contiguous United States.
Brettschneider also calculated another, much longer route that makes use of cool summer temperatures in Alaska and western Canada.
-via Twisted Sifter