The city of Constantine is growing without rethinking or reconsidering the relationship between climate and urban form. The city is thought in terms of the number of buildings to be erected, while the question about where they will be located is completely overlooked. The fact of thinking of space as various units based essentially on the spread of the territory and the quantity of houses explicitly leads to the disqualification of urban space and consequently a divergence between designed space and urban practices. The objective of this study is to find the right adequacy between the inhabitants as users, the environment as fitted out space, and the microclimate attributed to this environment; indeed, the improvement of human comfort depends on the adaptation of the climate to the urban design. This research attempts to evaluate the microclimate of the Boulevard of Boussouf district from an experimental program. This program uses two methods. The first method consists of observing outdoor space practices and a survey of 100 people to understand their use. To process the results of the survey, we used SPSS Statistics 17.0 software. The second method is the application of the ENVI-met3.1 software, which determines through numerical investigations the level of comfort of the chosen public space, from four parameters: the mean radiant temperature, the air temperature, the wind speed, and the comfort index, which all present themselves as climatic qualification indices. The two methods showed that the exterior space of the Boulevard of Boussouf district generally presents an uncomfortable thermal environment in summer; this is due to the fragmented morphology of the space, its East-West orientation considered by several researchers unfavorable and confirmed by this study, as well as the lack of protection of outdoor spaces and the absence of vegetation.