How does climate affect human activites in Mexico?

Answer 1

Climate and weather, which in turn affect vegetation and economic activities would undoubtedly affect where a person lives:

Northern Mexico is dominated by the Sonoran and Chihuahuan deserts. As such, the most important economic activities include mining and manufacturing; cities located in this area would require people to adapt to the scorching heat.

The climate in Southern Mexico and its coastal regions is overwhelmingly hot and humid, so the main economic activities include tourism and tropical agriculture (sugar cane, logging). Most people in these regions need to protect themselves from a high UV dose as well as a humidity factor of 50% or more.

The central highlands, also known as the Central Mexican Plateau, have a gentle climate (21 ºC / 70 ºF throughout the year), which have allowed a much higher population density. The economy is much more diversified in this region, including agriculture, manufacturing and most of the services provided in the country.

Answer 2

The economy of Mexico has been helped or hindered by climate. For example, the Chihuahuan desert is the result of a 'rain shadow' effect induced by the Sierra Madre Occidental. This has limited agriculture to small fertile pockets within Mexico, which cover only 12-17% of Mexico's territory.
Nonetheless, you should be aware that Mexico's territory is huge, so even if only 12-17% of its territory is suitable for agriculture, it is still considered a big expanse of land: 232,761 square kilometers (89,869 sq mi), which are almost the size of the whole United Kingdom, are used to grow food and cash crops; then another 16% of Mexico's territory (315,608 sq km/121,857 sq mi or a bit bigger than Poland or New Mexico) is considered as man-made or natural pastures, where cattle of several species is raised, including bovine and caprine.