When do Pyrenean rivers usually reach their greatest flow?

Pyrenean rivers typically reach their greatest flow during the spring, a period characterized by maximum rain and the melting of snow.1

Because the hydrographic system consists of short, torrential rivers, their flow is extremely variable and heavily influenced by the local climate and relief. While spring provides the peak discharge, the rivers experience different periods of low water during the summer and winter months. In the northern zones and the Western Pyrenees, the rainfall pattern contributes to greater flow regularity, resulting in only slightly lower water levels during the summer.1