What season is it to see willows along the river in May, 969?

"In May 1969, I watched willows along the river" refers to spring, which means "In May 1969, the earth gradually rejuvenated, willows sprouted, and the weather turned from cold to warm", which comes from "Jiujiu Song", also known as Winter Jiujiu, and is a folk solar term of the Han nationality.

"Looking at willows along the river in May 1969" means that willows in some places have begun to sprout. "Counting nine cold days" means counting nine every nine days from winter to Sunday until the eighty-first day of "99", when the peach blossoms are in full bloom, the weather will be warm.