Sana’a, the capital of the Republic of Yemen, lies in the highlands on a plateau 2,200 m –2,300 m above sea level and is surrounded by several mountains. It has a population of 1,747,834 (2004 census) which undergoes an average annual increase of 5.55%. Sana’a is characterized by a cool and dry winter (temperatures ranging between
subzero and 15 °C and a hot rainy summer (13-26°C). The average annual rainfall ranges between 150
-400 mm and is distributed between two seasons; February-May which is the secondary rainy season, and July – October is the main rainy season.
