section_path: Geography/Climate
section_name: Climate
paragraph_text: Climate
  
  The climate of Mexico is quite varied due to the country's size and topography. Tropic of Cancer effectively divides the country into temperate and tropical zones. Land north of the Tropic of Cancer experiences cooler temperatures during the winter months. South of the Tropic of Cancer, temperatures are fairly constant year-round and vary solely as a function of elevation. This gives Mexico one of the world's most diverse weather systems. Maritime air masses bring seasonal precipitation from May until August. Many parts of Mexico, particularly the north, have a dry climate with only sporadic rainfall, while parts of the tropical lowlands in the south average more than 2,000 mm (78.7 in) of annual precipitation. For example, many cities in the north like Monterrey, Hermosillo, and Mexicali experience temperatures of 40 °C (104 °F) or more in summer. In the Sonoran Desert temperatures reach 50 °C (122 °F) or more.
  
  Descriptors of regions are by temperature, with the tierra caliente (hot land) being coastal up to 900 meters; tierra templada (temperate land) being from 1,800 meters; tierra fría (cold land) extending to 3,500 meters. Beyond the cold lands are the páramos, alpine pastures, and the tierra helada (frozen land) (4,000-4,200 meters) in central Mexico. Areas south of the Tropic of Cancer with elevations up to 1,000 m (3,281 ft) (the southern parts of both coastal plains as well as the Yucatán Peninsula), have a yearly median temperature between 24 and 28 °C (75.2 and 82.4 °F). Temperatures here remain high throughout the year, with only a 5 °C (9 °F) difference between winter and summer median temperatures. Both Mexican coasts, except for the south coast of the Bay of Campeche and northern Baja California, are also vulnerable to serious hurricanes during the summer and fall. Although low-lying areas north of the Tropic of Cancer are hot and humid during the summer, they generally have lower yearly temperature averages (from 20 to 24 °C or 68.0 to 75.2 °F) because of more moderate conditions during the winter.