Who was the greek goddess that changed the seasons?

In Greek mythology, the goddess Persephone was Hades' wife, and stayed with him in the Underworld for four months out of the year. When Persephone is gone, her mother, Demeter, the goddess of the harvest, grieves and stops caring for the world. This is supposed to result in winter. When Demeter's daughter returns, She is happy again, creating spring.