I've heard of at least one dinosaur fossil discovered in Antarctica, so I figure the weather isn't a limiting factor.
Both were a lot warmer than they are today.
I suspect the limiting weather factor Anthony was referring to is that of present conditions impeding excavations.
it was....but I hadn't been specific.
my apologies to all
As for the Antarctic dinosaur fauna; Cryolophosaurus may be the only *named* taxon, but plenty of other material is also known (other theropods, a sauropod, a nodosaurid, plateosaurids, and a bunch of different types of ornithopods).
what, no Dyncodonts? (hey, isn't there a Cretaceous one?) :D