As always, the question is 'with how much certainty'? At low enough certainty I could predict what parts of the world will get dryer or wetter on the back of an

As always, the question is 'with how much certainty'? At low enough certainty I could predict what parts of the world will get dryer or wetter on the back of an envelope, but there are a lot of unknowables like human activity that would have to be included to make a quite reliable prediction.