Good point about habit. I find it interesting that so many Scandinavian immigrants settled in MN. ancestry on both sides of me goes back to Sweden and Norway (not too long ago). I find I am highly adaptable to temperature. I’m never too hot or too cold it seems. The super dry and cracked skin on my hands during winter also seems to be a Scandinavian trait.
Although, no Saami history appears in my records were all blonde and red heads.
You also need a rather "perfectly round" head. The Sa'ami, through the forces of random chance, are going through a "round head" cycle these days.
As far as "climate range" is concerned, I definitely think that's a very real factor.