As far as climate, the one thing that strikes me is that there's very little land mass, particularly in the south. That has a pretty significant affect on global climate, lowering temperatures. Even on earth the southern hemisphere is notably colder than the north because of this. Bear in mind that many climate maps of the world end at the southern tip of South America, but in the north extend all the way to the North Pole. That's quite a distortion; Cape Horn is at 56 S; a lower latitude than most of Russia, all of Scandanavia, Greenland, Alaska, and half of Canada. As a result it conceals the off-centre position of the climate zones.

Compare, for example, the climate of Porto (Portugal) and Wellington (NZ). Both are coastal cities, and both at about the same latitude, but their climates are hugely different.