This study aims to analyze the patterns and trends of daily rainfall in Northern Sumatra across different phases of the Indian Ocean Dipole (IOD), namely Positive IOD, Negative IOD, and Neutral IOD. The research utilizes data from BMKG observation stations, including Sultan Iskandar Muda Meteorological Station, Malikussaleh Meteorological Station, FL Tobing Meteorological Station, Binaka Meteor…