SB 5.22.3
sa esa bhagavan adi-purusa eva saksan narayano lokanam svastaya atmanam trayimayam karma-visuddhi-nimittam kavibhir api ca vedena vijijñasyamano dvadasadha vibhajya satsu vasantadisv rtusu yathopa-josam rtu-gunan vidadhati.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The original cause of the cosmic manifestation is the Supreme Personality of Godhead, Narayana. When great saintly persons, fully aware of the Vedic knowledge, offered prayers to the Supreme Person, He descended to this material world in the form of the sun to benefit all the planets and purify fruitive activities. He divided Himself into twelve parts and created seasonal forms, beginning with spring. In this way He created the seasonal qualities, such as heat, cold and so on.