About twenty years ago I read a novel about a planet with extreme climate variations. Over the course of a year (more or less the length of an Earth year) the climate changed drastically from brutal winter to brutal summer. There was a belt of temperate climate that migrated north to south to north, and the residents formed two societies; one that migrated with the temperate band like the native animals did (20-30 miles a day, as I recall), and others who hunkered down and toughed out the hard times and made the best use of the temperate times they could. Does anyone know its name or author?
I am looking for a novel based on seasonal change that is much more frequent than that of the Helliconia series. And if this helps - the residents came from a technologically advanced Earth society via interstellar travel but the harshness of the world rendered their society much more primitive, roughly 19th century for the stationary people, and hunter-gatherer for the nomads.