If we consider that all latin countries the world over aren't noted for their economic prosperity, and further note that almost all Northern countries are economic powerhouses, we can quickly see that there must surely be some relationship between climate and economic performance.
I would hazard that warmer countries have lazier inhabitants who love nothing more than to sleep the most productive part of the day away with siestas and 40 winks, while their Northern brethren, innoculated against laziness by an unforgiving, freshening climate, get down to work and stay at work, creating a vastly more productive nation.
Where are the economic basketcases in the world? By my theory, they should be concentrated around the equator, and economic performance should gradually increase as you get further away from this girdle of stagnation around the world's centre.
If we look at the facts, we can see this is indeed the case.
I would also argue that a successful economy needs a degree of self sacrifice for the good of the nation, the Volk. Oftentimes this is unconscious. America, Britain, Germany & other northern nations consider themselves to be founded upon an ideal of individual rights, but those rights are expressed in terms of how one should interact with others, betraying their collectivist nature. "You have a right to free speech" is just another way of saying "You have a duty not to hinder the speech of others."
Warmer countries are much more individualistic, meaning they have no truck with such collectivist, social constraints. This is especially apparant in sub-saharan Africa, where the masses are so individualistic that states there can only exist through military force, unlike the North, where the idea of "nationality" ensures that everyone subscribes to the same values, the same identity (more or less) and that they never cross the line and become too individualist.
I think this is because in the colder nations, people have to look out for each other to a far greater degree than in the south. Who can doubt that an especially cold winter draws a community together? Further, warmth breeds a degree of insouciance in people. A feeling of "not giving a fuck." I further suspect that the prevalence of marijuana in warmer nations has grave cultural effects on the work ethic there. How apt that, when Northern countries were using hemp to make the sails and ropes that would allow them to conquer the globe, southerners were 'toking up' and lazing about. I suspect this is the cultural origin of the "siesta."
Even in terms of personality, we can see that southerners are far more varied and interesting than northerners. Who can doubt the wonderful personalities of the Italians, the Mexicans, the Spanish, Morrocans, Egyptians, & Senegalese? They are far more varied and interesting than their stodgy Anglo/German/Scandinavian northern equivalents. We northerners have forgotten what it is to exist for ourselves, to have fun, and have sublimated our own desires for the good of the state & society. This northern fascism (for that is what it is) certainly guarantees a good standard of living for everybody, as long as we play by the rules, but are we really having fun?
I myself am not bothered so much by this state of affairs. I think it is good that we in the North unwittingly work for our fellow man and sacrifice ourselves for the common good, when the alternative is fun individualism but a short, chaotic, miserable life as seen in Latin America, Africa, and so on.
We may be born into the world, but we are raised in the bosom of society & the state, and later in life we should pay our dues accordingly.