Mexico is bisected by the tropic of Cancer; therefore, the southern half is included in the Torrid Zone. In general, climate varies with elevation. The tierra caliente (hot land) includes the low coastal plains, extending from sea level to about 914 m (3,000 ft). Weather is extremely humid, with temperatures varying from 15.6° to 48.9° C (60° to 120° F). The tierra templada (temperate land) extends from about 914 to 1,830 m (3,000 to 6,000 ft) with average temperatures of 16.7° to 21.1° C (62° to 70° F).
The tierra fría (cold land) extends from about 1,830 to 2,745 m (6,000 to 9,000 ft). The average temperature range is 15° to 17.2° C (59° to 63° F). The average temperatures in Mexico City for the months of January and July are 12.6° C (55° F) and 16.1° C (61° F), respectively. The average temperatures in Monterrey for the same months are 14.4° C (58° F) and 27.2° C (81° F).
The rainy season lasts from May to October. Although sections of southern Mexico receive about 990 to 3,000 mm (39 to 118 in) of rain a year, most of Mexico lacks adequate rainfall. Rainfall averages less than 635 mm (25 in) annually in the tierra templada, about 460 mm (18 in) in the tierra fría, and about 254 mm (10 in) in the semi-arid north. Annual precipitation averages for Mexico City and Monterrey are 750 mm (30 in) and 580 mm (23 in) respectively. © "Mexico" © Emmanuel Buchot and Encarta
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