Instructions Climate Climate varies according to altitude. The climate of the inland highlands is mostly mild, but sharp changes in temperature occur between day and night.
Rainfall varies greatly from region to region.
Only the Sierra Madre Oriental, the Isthmus of Tehuantepec and the state of Chiapas in the far south receive any appreciable amount of rain during the year, with the wet season running between June and September. All other areas have rainless seasons, while the northern and central areas of the central plateau are dry and arid. There is some snow in the north in winter.