What are characteristics of Doldrums?

Doldrums are formed in the equatorial belt of low atmospheric pressure where the North-East and South-East trade winds converge on and meet each other, forming calms and light surface winds and a strong upward air movement.

Thus, in spite of the calms and light winds, the Doldrums are characterized by stormy and turbulent weather, having thunderstorms·, heavy rains, and squalls. Because of their lack of wind, they use to be avoid by sailing ships.