The hinkâra is spring, the prastâva summer, the udgîtha the rainy season, the pratihâra autumn, the nidhana winter. That is the Vairâga Sâman, as interwoven in the seasons.
In plain words: The five parts of the chant are matched to the seasons: spring, summer, the rainy season, autumn and winter. This is the Vairâga chant found in the seasons.