I don't think this can be dismissed quite so easily - in terms of Men.
Angband and Utumno were established as the mythical reason for cold. I'm a little vague on Carn Dum, but was that not associated with the Witch King? And Dol Guldur is Sauron's northernmost outpost, and it is in the south end of Rhovanion.
Obviously, when dealing with maps, there will be some fluidity, but the basic pattern holds. Again, why the special status of northern Men in Tolkien's legendarium?
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