Sayyiduna Abdullah bin Jarad (may Allah be pleased with him) narrates that whenever the Prophet (peace and blessings be upon him) prayed for rain, he would say: "O Allah, give us rain that helps us and quenches, with which You give ample provision to Your servants, increase the milk and give life to the crops." And he also added these words: 'Hani'an mari'an' (one that is pleasant and brings lushness).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الاستسقاء / 6442