The analysis of the performance of atmospheric systems in the central region of Rio Grande do Sul allowed the individualization of the different types of time associated to them, resulting from different behavior of the meteorological elements and obtained through the technique of rhythmic analysis. The identified patterns, fifteen, made it possible to establish three large families of time types according to the responses provided by the atmospheric elements to the advance and dominance in the region of extratropical systems, intertropical systems or their time-destabilizing mechanisms .
