World's largest hot desert. Located in north Africa and covers over 3,500,000 square miles (9,000,000 sq km) or roughly 10% of the continent. Mean temperature over 30 degrees C. Variations may also be huge, from over 50 degrees C during the day, to temperatures below 0 at night in summer.
Fall begins (Northern H.) History. Fall begins in the Northern Hemisphere when the Sun is perpendicular to the equator. This day has equal hours of day and night. The first day of Fall is also called the Autumnal Equinox. In many areas it coincides with harvests. The first day of Fall happens between each year between September 22 and 24.
What is the Fall/Autumn Season? Start & End of Fall/Autumn 2017 â Also known as autumn, fall is the season that follows summer and precedes winter. In the United States, there is a term called âautumnal equinoxâ, which simply means that the daytime and nighttime hours are the same. This occurs every 23rd of September, following shorter day time.