One of my favorite passage about rain is Isaiah 55:9-11…
For My thoughts are not your thoughts,
Nor are your ways My ways,” declares the LORD.
“For as the heavens are higher than the earth,
So are My ways higher than your ways
And My thoughts than your thoughts.
For as the rain and the snow come down from heaven,
And do not return there without watering the earth
And making it bear and sprout,
And furnishing seed to the sower and bread to the eater;
So will My word be which goes forth from My mouth;
It will not return to Me empty,
Without accomplishing what I desire,
And without succeeding in the matter for which I sent it.