GDO Standardized Precipitation-Evapotranspiration Index ERA5, 1-month accumulation period (SPEI-1) (version 1.0.0)

The 1-month Standardized Precipitation-Evapotranspiration Index (SPEI-1) is an indicator used to monitor meteorological drought based on precipitation and reference evapotransipration. Anomalies over 1-month accumulation periods. SPEI-1 serves as a proxy indicator for immediate impacts of droughts such as reduced soil moisture, snowpack, and flow in smaller creeks. The input data for calculating the SPEI-1 is ERA5 precipitation and temperature reanalysis.