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A polar day refers to a day when the sun does not set for 24 hours. This occurs because the top of the earth tilts toward the sun during one half of the year. Areas in the very northern and very southern parts of the globe are the only regions that experience both polar days and polar nights.
The polar climate regions are characterized by a lack of warm summers. Every month in a polar climate has an average temperature of less than 10 Â°C. Regions with polar climate cover more than 20% of the Earth. The sun shines for long hours in the summer, and for many fewer hours in the winter. A polar climate results in treeless tundra, glaciers, or a permanent or semi-permanent layer of ice. It has cool summers and very cold winters.