It is springtime in Kaiamaville, and very hot indeed. Aaron Apple is sitting under the largest apple tree in his orchard and is worried because his apples aren't growing properly. He needs his apples to grow (as they have vitamins in them that help people stay healthy). But this won't happen until his orchard gets watered, which he cannot do alone. So Aaron plans to look for his old friend the fair weather cloud, Mr. Cumulus. However, he finds out that he won't have to because his good mate, Billy Bean, arrives and tells him that Mrs. Nimbostratus (the dark rain carrying cloud) is on her way!