If you want nice weather in the winter you'll have to head far south - southern Florida, Texas and New Mexico near the Mexico border, southern Arizona and southern California. The Rocky Mountains are wonderful in the summer. Northern California and the Oregon and Washington coasts are nice too. Spring and fall can be spent traveling. Just check the weather along your routes for tornadoes, flooding and early or late snow storms. When your house can move there's no reason to spend time where the weather is bad!