Iran's geopolitical position and the constant presence of external threats, the necessary measures to preserve and protect the country's territorial integrity are a necessity. One of the measures that can prevent damage to the country is to evaluate the state of the country's military climate. Therefore, in this research, the temporal and spatial distribution of the country's military climate was investigated using the Military Climate Index and gis. For this purpose, the statistics of various meteorological parameters of 55 synoptic stations with appropriate distribution throughout the country during the 30-year statistical period (1992-2021) were used. The results of the time distribution showed that the months of OCT, Apr and Mars are the most suitable months for carrying out military activities in the country. Inappropriate months for carrying out military activities based on the percentage of the country's area are July, June, August and December respectively. Among the seasons, the most unsuitable season for conducting military operations is the summer season and then the early winter season, which showed the most unfavorable descriptive values, therefore, the most suitable season is spring and autumn, and the most suitable months are October and April. The spatial distribution of changes in the MCI index also showed that the most unfavourability in most days of the year is related to the southeast, south and then north and northwest regions of the country. In terms of stations, the highest MCI coefficients or the highest level of unpleasantness are related to Saqez, Jask, Chabahar and Rasht stations.