“In Seattle, I had constant back pain,” says Denis Asahara of his life before moving to Mexico’s Pacific coast. “The cold, humid weather made it worse. Here, in much warmer weather, 90% of my pain is gone. Also, the almost constant sunshine means I’m almost unlimited in my choices of things to do.” Mexico is big, with mountains, jungles, deserts, and thousands of miles of coastline. So picking your perfect climate is part of the fun. If you love the heat, for instance, there’s the Yucatán. In the city of Mérida, on the Yucatán Peninsula, summer temperatures can hit 110 F.