Summary
The "Global Aridity Index and Potential Evapotranspiration Database - Version 3" (Global-AI_PET_v3) provides high-resolution (30 arc-seconds) global hydro-climatic data averaged (1970-2000) monthly and yearly, based upon the FAO Penman-Monteith Reference Evapotranspiration (ET<sub>0</sub>) equation. An overview of the methods used to implement the Penman-Monteith equation geospatially and a technical evaluation of the results is provided. Results were compared for technical validation with weather station data from the FAO "CLIMWAT 2.0 for CROPWAT" (ET<sub>0</sub>: r<sup>2</sup> = 0.85; AI: r<sup>2</sup> = 0.90) and the U.K. "Climate Research Unit: Time Series v 4.04" (ET<sub>0</sub>: r<sup>2</sup> = 0.89; AI: r<sup>2</sup> = 0.83), while showing significant differences to an earlier versi
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