The Navajo Nation (NN) is the largest federally recognized tribe in land area, of over 70,000km2, and faces challenges related to water management during long-term droughts. Currently, the Navajo Nation Department of Water Resources (NNDWR) reports on drought and climatic conditions through the use of regional Standardized Precipitation Index (SPI) values and a network of in-situ rainfall and climate data. However, these data sources lack the spatial detail and consistent measurements needed to provide a coherent understanding of the drought regime within the Nation’s boundaries.