What season is described in Bai Man's biography "The Rain in Zigui"?

This sentence comes from Weng Juan's poem April in the Country in the Song Dynasty:

The mountains and plains are all green, and the sound of Zigui is raining like smoke.

In April, there were few idle people in the countryside, and sericulture was planted in the fields.

The rain in the Voice of Rules describes (in the fourth and spring of the lunar calendar, when the agriculture is busy, rice planting begins. )

Because according to the traditional 24 solar terms, April belongs to spring. For reference.