There are far colder places in Alaska than the North Slope. Interior cities like Fairbanks on occasion see temps of 40 below during the winter.
If Alaska had better weather, far far more people would be living there. Including myself. It's my favorite vacation destination of 1,000 or more miles away but since I'm a California kid, I'll only go there duriing the summertime.
Fairbanks record is -62 F. Record low for Barrow is -56 F. Being close to the ocean doesn't help much when it's covered with ice & the sun doesn't shine. Fairbanks is 446' in elevation, vs 10' for Barrow.
Fairbanks normally has greater winds than Barrow and so it feels a lot colder in the Interior city.
Barrow may be at sea level compared with 446 feet for Fairbanks but Barrow is also several degrees north of Fairbanks in latitude. Barrow is at something like 69 degrees north latitude whereas Fairbanks isn't even north of the Arctic Circle.