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.
Best Answer: September 23 but I always thinks that it's fall when it starts getting cold but that's just wishful thinking on my part. While fall starts on September 22 or 23 on the calendar, Meteorological Autumn actually varies due to several conditions, such as, temperature, moisture, and sunlight levels. Areas of northern Minnesota, northern Maine, and the upper peninsula of Michigan can start seeing Autumn like conditions as soon as September 1.