Dust storms occur most frequently during the spring and early summer months. This is because:

* Dry conditions: During these months, the ground is typically dry and parched after a long winter, making it susceptible to wind erosion.

* Strong winds: Spring and early summer often bring strong winds, which can pick up loose soil and create dust storms.

* Lack of vegetation: Many areas experience less vegetation during these months, further contributing to exposed soil.

However, it's important to note that dust storms can occur at other times of the year as well, depending on the specific location and weather conditions.