Objective: Before starting an activity or a military mission, the military units check the weather and the ground of the region and evaluate its effect on the assigned missions. The purpose of this research is to determine the effect of 120-day winds on military activities in the northern region of Sistan and Baluchistan province and on a case-by-case basis in the city of Zabul.
Methodology: Data related to wind direction and speed, horizontal visibility and the number of dust reports with a statistical period of 21 years (2000-2021) have been received from the Zabul synoptic station and subjected to statistical analysis.
Findings: In order to determine the effect of these winds on military activities, an expert interview was conducted with military experts, and in order to determine the proximity and desirability of the months of the year to the ideal desired by the experts, the TOPSIS method was used. The predominant wind is in the northwest region and the highest wind speed and the lowest visibility occurred in the summer season.
Conclusion: The results showed that the months of Azar, January, November, Bahman, Farvardin and Mehr are the closest to the military ideal in terms of weather (horizontal visibility, direction and wind speed) and the months of July, August, June and September are the most distant from the ideal. They have the weather for military activities in the studied area. Any military activity at this time will bring the least benefit and the most negative effect in terms of weather conditions.