French Translator

The French translation of "good rain knows the season, when spring comes" is:

The happiest time comes on the first day of spring.

La pluie joyeuse is used here, and similar la pluie bienfaisante can also express the same meaning. This is an objection, indicating that it likes rain or good rain.

La bonne pluie is a literal translation.

English version found:

Good rain knows its correct time;

A good rain knows its proper time;

When spring comes, it will fall.

It waited until spring came.

Good rain here is good rain, literally equivalent to la bonne pluie.