Geography and Climate
Mexico is located in the southern portion of North America. It is bounded to the north by the United States, to the west and south by the Pacific Ocean, to the east by the Gulf of Mexico, and to the southeast by Belize, Guatemala, and the Caribbean Sea. The northernmost constituent of Latin America, it is the most populous Spanish-speaking country in the world.
The Tropic of Cancer effectively divides the country into temperate and tropical zones. Land north of the twenty-fourth parallel experiences cooler temperatures during the winter months. South of the twenty-fourth parallel, temperatures are fairly constant year round and vary solely as a function of elevation.
Areas south of the twentieth-fourth parallel with elevations up to 1,000 meters (the southern parts of both coastal plains as well as the Yucatán Peninsula), have a yearly median temperature between 24°C and 28°C. Temperatures here remain high throughout the year, with only a 5°C difference between winter and summer median temperatures. Although low-lying areas north of the twentieth-fourth parallel are hot and humid during the summer, they generally have lower yearly temperature averages (from 20°C to 24°C) because of more moderate conditions during the winter.
Between 1,000 and 2,000 meters, one encounters yearly average temperatures between 16°C and 20°C. Towns and cities at this elevation south of the twenty-fourth parallel have relatively constant, pleasant temperatures throughout the year, whereas more northerly locations experience sizeable seasonal variations. Above 2,000 meters, temperatures drop as low as an average yearly range between 8°C and 12°C in the Cordillera Neovolcánica. At 2,300 meters, Mexico City has a yearly average temperature of 15°C with pleasant summers and mild winters. Average daily highs and lows for May, the warmest month, are 26°C and 12°C, and average daily highs and lows for January, the coldest month, are 19°C and 6°C.