The New Zealand Drought Monitor is a system for keeping track of drought conditions across New Zealand based on a standardised climate index. The index, called the New Zealand Drought Index (NZDI), is a climate data-based indicator of drought based on four commonly-used climatological drought indicators: the Standardised Precipitation Index, the Soil Moisture Deficit, the Soil Moisture Deficit Anomaly, and the Potential Evapotranspiration Deficit. The index has five categories: Dry, Very Dry, Extremely Dry, Drought, and Severe Drought. It is presented as a map and as charts; updated daily (note, there is a two-day time delay to ensure all available data is used).