The areas north of the Arctic Circle and south of the Antarctic Circle are the north and south frigid zones, respectively. They are also called the polar regions. The center of the zone, called the pole, experiences six months of daylight and six months of night. This region is subject to severe winters. The north frigid zone includes northern Canada, Alaska and northern Russia. The south frigid zone comprises the continent of Antarctica.
The north and south temperate zone lie between the Arctic Circle and the Tropic of Cancer and between the Tropic of Capricorn and the Antarctic Circle. Mild climatic conditions prevail here. The sun is never overhead. This zone experiences four annual seasons, Spring, Summer, Autumn and Winter. The North Temperate Zone includes Europe, northern Asia and North America. The South Temperate Zone includes southern Australia, New Zealand, southern South America and South Africa.
The tropics are the region of the Earth centered on the Equator and limited by the Tropics of Cancer and Capricorn. This is the hottest part of the earth. It experiences two annual seasons, a dry summer and a wet summer. The tropics include most of Africa, southern Asia, Indonesia, northern Australia, Central America and northern South America.