full text of the classic FAA guide
The Arctic, strictly speaking, is the region shown in figure 131 which lies north of the Arctic Circle (66½° latitude). However, this chapter includes Alaskan weather even though much of Alaska lies south of the Arctic Circle.
Because of the lack of roads over most Arctic areas, aviation is the backbone of transportation between communities. As the economy expands, so will air transportation.
Your most valuable source of information concerning flying the Arctic is the experienced Arctic flyer. To introduce you to Arctic flying weather, this chapter surveys climate, air masses, and fronts of the Arctic; introduces you to some Arctic weather peculiarities; discusses weather hazards in the Arctic; and comments on Arctic flying.
FIGURE 131. The Arctic. The Arctic Circle is at 66½° N latitude.