In Mato Grosso, state located in the Brasilian Midwest, some of these climatic references have names that are known in much of its territory: The "Janeirinho" is the name given to the reference of the forecast of rains for the whole year from the observation of the occurrence of this event in the first days of January; the "rain of Saint Joseph", whose absence of can indicate a more rigorous drought in the current year; the "cashew rain" refers to precipitation that occurs at the height of the drought; precipitations that can be favored by the "passage of moon"; and the arrival of the "great waters" from the reappearance in the night sky of the constellation Pleiades. Thus, with the objective of recovering this popular knowledge, this work analyzed daily precipitation data, between 1961 and 2017, and sought to quantitatively identify these references
