*Descriptive parameters of drought sequence*

#### - *Maximum duration of drought sequences*

Duration is an important characteristic of drought. In fact, if a drought starts quickly under some weather conditions, it usually takes at least two to three months before it can spread to other regions. It can then persist for months or even years. The calculation of the duration is as follows [25]. (Equation (2)).

$$\mathbf{D} = (\mathbf{A}\_{\text{ernd}} - \mathbf{A}\_{\text{irinitial}}) \tag{2}$$

*Ainitial*: Year of the initial dry period; *Aend*: Year of end of the dry period
