1. Increase in Temperature accompanied by excessive evaporation.
2. prolonged period of drought or very low rainfall
3. Existence of cold ocean currents, offshore which flow across the path of onshore rain bearing winds
4. Presence of high mountains which block rain bearing wind and causes rain shadow effects
5. Remoteness of land in the interior of continents far away from direct influence of the sea
6. Location of an area in a region of anticyclones where winds are descending and diverging
johnmulu answered the question on January 13, 2017 at 13:16