This study aims to estimate the potential evapotranspiration as well as to extract categorized maps of climate parameters that are applicable for civil and architectural design . The results showed that the Albrecht model estimates the potential evapotranspiration better than other models in the most provinces of Iran. The best values of R² were 0.9854 and 0.9826 for the Brockamp-Wenner and Albrecht models in Bushehr (BU) and TE provinces, respectively. Finally, a list of the best performance of each model has been presented. The best weather conditions (not only for Iran but also for all countries) to use mass transfer-based equations are 23.6-24.6 MJ/m²/day, 12-26 ℃, 18-30 ℃, 5-21 ℃, and 2.50-3.25 m.s^-1 for solar radiation, mean, maximum, and minimum temperature, and wind speed, respectively. The results are also useful for selecting the best model when researchers must apply humidity-based models on the basis of available data. In addition, the designed maps and categories are applicable for considering the role of climatic parameters in architectural evaluations over Iran.