Not even close. Winter weather impacted intellectual evolution for thousands of years but society has developed to the point where it no longer has any significant impact in terms of killing off the less intelligent. Northern states have higher iqs because the opportunities for high paying jobs is vastly greater in the north than the south which tend to attract more intelligent people. Now you would probably say that that is because they are smarter and therefore created more prosperous communities but that would also be false. They are more prosperous because of their location to historically key ports of trade.
Erm... how's that explain MT, WY, ND, SD, NE, MN, KS, IA... flyover country isn't exactly ripe with high paying jobs, at least not white-collar ones.
I'm somewhat biased, born and raised in WY, so I have some perspective there. The school systems are (were?) well funded by extractive energy taxes. We had computer labs and computer classes in the early 80's, funded by those same taxes. Everytime I ask/see info about teaching jobs there, it's a low demand/high supply situation so WY gets to be picky on who's hired. Mostly I vividly remember the standardized tests (shit, from nearly half a century ago), my schools, as an average, were in the 90%+ range for the country over at least the 3 tests I remember. And that was WITH Shosoni and Arapahoe (indian) kids since my town was just off the Rez.
Mind you, my home town about turned into a ghost town when the main employer closed shop, that being an iron mine. Very much a blue-collar town.
Also to seats of power in DC and New York which essentially funnel the productivity off the rest of the nation. In addition to the north leveraging a war against the south that's been maintained through anti white Jim Crowe for at least 250+ years. It wasn't until recently that the North has had to start "integrating" but they've pushed that ideology on the south at military gunpoint for quite a long time and its affects are apparent. The North will now reap what they sow.
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