Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) says: The people of Ta'if said: O Messenger of Allah! Our land is very cold, so what will suffice us for the ritual bath for janabah (major impurity)? The Messenger of Allah (peace and blessings be upon him) said: "As for me, I pour water over my head three times."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 842