The climate manifests itself both as time and space and so, following contradictions and movements,each of its elements will have their own rhythms, habits and exceptionalities. In turn, the interactions between them and society are part of a dialectical reality that need to be recognized, because changes in the regime of weather typologies directly or indirectly affect people's lives, bringing disruption to a population that is not prepared to deal with such weather, bringing disorders to a population that is not prepared to address such inclement weather. In this context, the present study aimed to study the rhythm of rainfall recorded in the Rio Negro hydrographic basin, located in the Southeastern region of Brazil, through the proposal and construction of graphs for years that were considered exceptional for the region, in its annual and daily sequencing. The results indicated that the rains behaved differently in dry and humid years, with regional or local geography and atmospheric systems being the main factors responsible for such variations.