Here are the lyrics I got from a barbershop quartet CD.

Rain, when ya gonna rain again, Rain, grow the golden grain again.
Shower your blessings on me (let it rain)
Rain, make the rivers deep again,Rain please don't let me weep again.
Shower your blessing on me
The cows in the meadow and the sheep in the corn, know that something is wrong
Old Mother Earth can never give birth, when you're away so long.
Rain, make it green in lover's lane, Rain, for my gal and me again
Shower your blessings on me.