Weather is one of the most important geographical factors affecting defense and military affairs. One of the concerns of combatant commanders at the scene for future long-term planning is to be aware of the military climate calendar in different regions. The southeastern region of the country is important due to its proximity to as well as specific climatic conditions such as the occurrence of 120-day Sistan winds with dust and visibility, and the impact of summer monsoon weather on military planning. In this study Seven stations with a statistical period of over 30 years were selected and climatic data on various parameters were obtained from the Meteorological Organization. Then, after determining the importance of each of the climatic parameters, the status of the area was studied in terms of the suitability of climatic conditions for various military operations at the present time as well as in the 1420 landscape. The results of the study showed that the least favorable months for military operations in the region will be June and August, while among the studied stations the least favorable is Zabul and Zakak stations Also the most favorable military climate in the region is in the months of November, October and March, among the stations of the province, Chabahar and Saravan stations in this month have more favorable climate than others. Finally, in order to predict future climate conditions, two scenarios were presented as "hard military climate" and "natural climate manipulation".