Standardized Precipitation Evapotranspiration Index (SPEI)
The Standardized Precipitation Evapotranspiration Index (SPEI) is computed similarly to the SPI. The main difference is that SPI assesses precipitation variance, while SPEI also considers demand from evapotranspiration which is subtracted from any precipitation accumulation prior to assessment. Unlike the SPI, the SPEI captures the main impact of increased temperatures on water demand.
- Publisher
- Agriculture and Agri-Food Canada
- Resources
- 9
- Catalogue metadata updated
- 2025-07-21
Data overview
- Formats
- ESRI REST, GEOTIF, HTML, PDF
- File languages
- English, French
Official sources and licences
Resources
- Agroclimate Interactive Maps (English) (English, HTML) HTML
- Agroclimate Interactive Maps (French) (French, HTML) HTML
- Data Product Specification (English) (English, PDF) PDF
- Data Product Specification (French) (French, PDF) PDF
- Pre-packaged GeoTIF files (No linguistic component) GEOTIF
- Standardized Precipitation Evapotranspiration Index (SPEI) (ESRI REST) ESRI REST
- Standardized Precipitation Evapotranspiration Index (SPEI) (ESRI REST) ESRI REST
- Using AAFC Climate Services (English) (English, PDF) PDF
- Using AAFC Climate Services (French) (French, PDF) PDF