Climate
The Köppen classification depends on average monthly values of temperature and precipitation. The most commonly used form of the Köppen classification has five primary types labeled A through E. These primary types are A) tropical, B) dry, C) mild mid-latitude, D) cold mid-latitude, and E) polar. The five primary classifications can be further divided into secondary classifications such as rainforest, monsoon, tropical savanna, humid subtropical, humid continental, oceanic climate, Mediterranean climate, desert, steppe, subarctic climate, tundra, and polar ice cap.
Guanajuato
Climates in the state are grouped by precipitation and average temperatures into three major groups. The semi-arid climate is characterized by the fact that evaporation often exceeds precipitation. Most of the vegetation in these areas is arid grassland with desert plants such as nopal. These climates cover about forty percent of the state, mostly in the north. Semi-arid temperate regions are found in the municipalities of San Felipe, San Diego de la Unión, San Luis de la Paz, part of Dolores Hidalgo and San José de Iturbide, where precipitation varies between 400 and 500 mm and the average temperature is between 16 and 18 °C. Semi-arid semi hot climates can be found north of Dolores Hidalgo, around León and in areas near Celaya. In these municipalities, rainfall averages between 600 and 700 mm and the average annual temperature is between 18 and 20 °C. Temperate climates are judged by the presence of holm oak and pine forest, pine forests and/or pine forests with meadows. Humidity varies in these forest regions. Temperate semi-moist areas are mostly found in the southeast municipalities of Apaseo, Coroneo and Jerécuaro and in the center of the state. Precipitation varies from 600 to 700 mm and the average temperature is between 16 and 18 °C. Temperate and somewhat humid climates have rainfall averages of between 700 and 800 mm, with temperatures between 16 and 18 °C. These can be found in Pénjamo, Coroneo, Jerécuaro and parts of Guanajuato (municipality) and Dolores Hidalgo. Temperate climates with the most humidity are found in the Santa Rosa and municipality of Guanajuato. These have rainfall averages of over 800 mm and average temperatures of under 16 °C. Hot and moist climates in the state have temperatures ranging from 18 to 22 °C and are associated with tropical rainforest, with some grassland. These climates are subdivided into two types, one that receives less rainfall with a significant dry season and the other which is wetter. The drier type is found in Abasolo, Irapuato, Salamanca and Romita. In total, these hot and relatively moist climates can be found in about 40% of the state.