In what countries have had a period of complete darkness?

Answer 1

In countries such as Sweden, basically those near the North Pole, winter may go as far as not seeing the sun for half a year.

This is because the Earth's axis is a bit tilted, 23.44° from the ecliptic to be more accurate, and as a result the geographic north does not receive uniform amounts of sunlight throughout the year. When the Northern Hemisphere experiences summer, the Earth is positioned in such a way that the geographic north is tilted towards the Sun. As the Earth continues on its orbit, the Sun lights the geographic north from different angles. Due to the tilt in the Earth's axis, there comes a time when the geographic north does not receive sunlight anymore. This usually occurs in the winter, when the geographic north is tilted away from the Sun.

But this is normal, and it soon returns to summer, when the Sun would be visible again.

The geographic south also experiences this, although I do not know any countries in close enough proximity to it.

Answer 2

Arctic and Antarctic regions have as little as 3 hours of daylight. In the United States. Alaska has more darkness per year than any other state. Remote regions of Greenland, Iceland, Britain,etc where the edges of those countries are closest to the poles have little sunlight.