Unlike regions with tropical and middle latitude climates, the polar regions have vary short summers. During the winter season, the sun is not seen for six months. When it is supposed to be summer, the sun's rays are so slanting that they give very little heat. There is very little precipitation because the air is too cold to hold much water vapor. If there is little water vapor, there will also be little precipitation that may form rain, hail or sleet.
The temperature during the warmest months is between O degree Celsius and 10 degree Celsius. During the cold months, the temperature may go lower than -25 degree Celsius. The poles are always covered with ice. Probably you can imagine how cold it is in the zone of polar climates. This zone has small and short plants such as grasses and mosses.