This document contains data on snow cover in three river basins in Chile - Nahuel Huapi National Park (NQN), Collon Cura (COLLON) and Limay (LIMAY) - measured annually on November 17th from 2002 to 2017. It includes tables with the date, snow cover percentages for each river basin, and a map showing the locations of the river basins. The data shows varying levels of snow cover across the basins and years, with the highest recorded between 2002 and 2017 being 8.5% for NQN in 2002, 9% for COLLON in 2002 and 2.5% for LIMAY in 2002.