This work presents bioclimatic charts for Mexico, as a result of an analysis of climate for the period 1951-1980. The basis to define the zone of thermal comfort was the equation proposed by Auliciems combined with the bioclimatic chart of Olgyay and the diagram of Givoni for bioclimatic control in buildings. Other tools used to carry out the diagnosis were the equations of Fanger. The results obtained were validated according to the parameters established by the American Society of Heating, Refrigerating and Air-Conditioning Engineering (ASHRAE), for the different climates of Mexico. The climatic data were those reported by 700 climatological stations throughout the country. The charts were developed using the ArcInfo program, in which the conditions of comfort, cool and warm were identified in order to achieve better thermal comfort in buildings and the profitable use of this renewable energy. (C) 2003 Published by Elsevier Ltd.