noun, Pathology. 1. the accumulation of excessive ketones in the body, as in diabetic acidosis. Origin of ketosis. 1915-1920.
Climate zones of Africa, showing the ecological break between the hot desert climate of the Sahara Desert (red), the hot semi-arid climate of the Sahel (orange) and the tropical climate of Central and Western Africa (blue).
Dry, Subtropical Climate. High-pressure cells at the Tropic of Cancer keep conditions dry and subtropical in the northern Sahara Desert. The hottest temperature on record for this region is 136.4 degrees, but winter evenings can get surprisingly cool, falling to around 55 degrees.