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Message: <blockquote data-quote="Umbran" data-source="post: 5344652" data-attributes="member: 177">There are some things that might create seasonal variation on a tidally locked world.  Even a locked world can have some "wobble" - thsi won't mean much at the noon and midnight poles, but could be a big thing for the twilight zone.  Also, the orbit can be eccentric (oval, rather than circular), leading to seasonal variation with distance from the star.The tidal forces involved (especially with a large moon with an orbital resonance) might create geologic "seasons" of volcanism, earthquakes, or tidal waves, tha tmight lead to any number of seasonal behaviors for plant and animal life....In fact, therein might lie your solution for the tendency for such planets to turn into deserts.  You expect the water tends to evaporate at Noon, and condense out and freeze at Midnight - eventually, it all ends up in an ice cap on the dark side.  If, on a regular basis, something geologic melts a lot of the water at Midnight, you might keep a water cycle rolling so the world doesn't become a dustball.Note that you can already see this in some areas of the tropics on Earth.  If there's enough rainfall that there isn't much of a  "dry season", plants just go at it.</blockquote>