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The darkest month: In the Arctic the sun reaches its lowest point below the horizon in December, and on an overcast day it is impossible to differentiate between day and night. The only natural light available is the moonlight, which lights up the surroundings on a clear day. The aurora borealis (northern lights) can also be seen during periods of clear weather during this dark period. The Arctic winter sets in with full force in December, as this is the first month during the season with cold and stable weather conditions.