Working out Global Biodomes and Rainfall Maps

[Soul_Reaper]

Hi guys, I've been working on my global map for my campaign setting to get a feel for the world before I move into a more more focused region, and while the rainfall and climate maps are interesting to me, I'd just like some more experienced eyes to give what I've done a once over, and offer any comments, suggestions or changes.

The world is basically earthlike, the only difference being that it is about 25% smaller than earth. There is a large, central mountain range on the continent on the middle (A), caused when two large tectonic plates collided millions of years ago. There is another, younger mountain range going north-south on the continent to the left (B), and another ridge-like range going east-west on the continent to the right (A).

From what I've inferred there should be a large rainfall shadow on the right hand side of mountain range A, which extends down south to connect with the subtropical region below it. On the left hand side of the range there would be increased rainfall, which results in snowfall due to the altitude. I've only gone over the other continents lightly, as my main focus is on the central continent (where most of the setting will be based). Furthermore, I'm also having difficulty with working out how the currents would flow, and how that would in turn affect the temperatures of the various regions.

Edit: See 4th post for new development.