Dwight Schrute
Member
There's actually a small possibility of that. I don't know if what I'm about to say has ever been brought up by anyone before but Martin has a science fiction short story from the 80s that takes place on a planet with pseudo-medieval levels of culture and technology that experiences summer and winter in cycles lasting for years.
EDIT: Its called Bitterblooms
I actually always wondered what the explanation for the long lasting seasons would be. Alway wondered if westeros was just a small part of something bigger.