America's fourth largest city of Houston (Houston) is located in southeast Texas, the Gulf of Mexico, the upper part of the plain, 80 km from the Gulf of Mexico, 49 feet (14.94 meters) above sea level. Greater Houston area (including the surrounding six counties), an area of 8778.31 square miles, a population of about 4.22 million (the end of 1995 estimate); Houston urban area of 596.11 square miles with a population of 2,208,180 (2009). Mainly whites, blacks, Mexican Americans, the Mexican population has grown rapidly in recent years. Houston's subtropical climate, the annual average temperature is 20.7 ℃, average annual rainfall is 1224 mm. April 2, 1986, Houston and Shenzhen City, Guangdong Province, China, became sister cities.
