dataset · Global

SPEIbase: Standardised Precipitation-Evapotranspiration Index database, Version 2.11

The Global SPEI database (SPEIbase) offers long-time robust information about drought conditions at the global scale, with a 0.5 degree pixel size and monthly cadence. It provides SPEI time scales from 1 to 48 months. The Standardized Precipitation-Evapotranspiration Index (SPEI) expresses, as a standardized variate (mean zero and unit variance), the deviations of the current climatic balance (precipitation minus evapotranspiration potential) with respect to the long-term balance. The reference

Source details

Licence: CC-BY-4.0

Evidence quality: 28

Listed in gee public catalogue API on 2026-10-16; relevance/value screened (haiku).

Metadata checked: 2026-10-14T13:20:00.000Z

Evidence

• ee.ImageCollection('CSIC/SPEI/2_11')
• https://developers.google.com/earth-engine/datasets/catalog/CSIC_SPEI_2_11

Check upstream coverage, uncertainty and licence before use. Station observations are not forecasts or design levels.