Thanks for the link. I definitely accept your point that temperature / climate has to be a strong determinant of behaviours that can be interpreted as 'intelligence' but also of other things.

To me, the biggest effect is likely to be an urgency to do something. In a warm climate it's better to take it easy, and you don't have to worry about shelter etc. In the cold you are going to have to get the fuck up and do stuff, and who wants to sit around relaxing.

But three issues come to mind. (I put these to you as genuine questions, as you seem to have properly thought about it).

First, is this biological or sociological? You can imagine it being either (or both), and you'd think this could be answered scientifically:

what are the biological correlates of warm or cold climates?

Second, just because you are in a warm climate and don't have the urgency of needing shelter etc, you will still be living at the edge of natural selection - because all living things do (or did until we started controlling our environment as we do now). Intelligence still had to be a major part of how people competed and survived in hot climates. So it's not obvious to me that urgency because of cold is more likely to foster evolution of intelligence than urgency because of, say, need to avoid predators or gather food efficiently. Perhaps its a different kind of intelligence?

Third there are plenty of very hot places with non-black races - what's your view of those people?