Nearly 33% of the Earth's land is covered in Arid climate. The word arid means dry. The two colors on the map represent warm and cold Arid climates. If land has an Arid climate it is usually a desert. Most deserts are found along the 30 degree latitude line (north and south of the equator). This is due to the pattern of cold water currents, which force dry air over the land. Other Arid climates exist in the center of continents or in the rain shadow of large mountain ranges. A rain shadow is land on a side of a mountain that is very dry because the mountain forces warm air higher into the sky, which cools it and it falls as rain, but only on one side of the mountain. Most Arid areas do not have regular seasons. For instance, the Sahara Desert is always hot and dry. However, some places do have changes in temperature depending on the latitude and the surrounding climates. So, since there are temperature differences, we can say there are 2 seasons, summer and winter. Hope this helps! ~ Autumn :)