In Alaska, there are long periods of darkness in certain regions since much of the state is located so far north of the Arctic Circle. Thus, those regions above the Arctic Circle experience unending daylight in certain summer months and unending darkness in some winter months.
It can be inferred from the above passage that

regions south of the Arctic Circle experience alternating dark and daylight in the winter and summer months.

Explanation

The selection states that regions north of the Arctic Circle experience unending periods of daylight and dark. However, regions below the Arctic Circle are not included in this analysis of daylight and dark.

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