Description

Difference from Average Precipitation represents the accumulated precipitation value for a location, subtracted by the long-term average value. A negative value indicates that the location has received less than the normal amount of precipitation (mm) for that timeframe. A positive value indicates that the location has received more than the normal amount of precipitation (mm). Time periods calculated for difference from average precipitation are 1, 2, 3, 6, 9, 12, 18, 24 months. Long-term average is 1991-2020. Each ISO week is numbered from 1 to 52 (sometimes 53) within a year. An ISO week starts on Monday and ends on Sunday. The National Agroclimate Series of Derived Indicators (NASDI) products provide a collection of comprehensive and regularly updated datasets on key agroclimatic variables, including accumulated precipitation, standardized precipitation index, and difference from normal temperature, among others. These datasets incorporate both real-time and historical climate information, offering enhanced insight into conditions and trends across Canada’s diverse agricultural regions.

Resources

Name	Format	Description	Link
Pre-packaged GeoTIF files (monthly)	Unknown		https://agriculture.canada.ca/atlas/data_donnees/nasdi/data_donnees/monthly/difference_from_average_precipitation/
Pre-packaged GeoTIF files (weekly)	Unknown		https://agriculture.canada.ca/atlas/data_donnees/nasdi/data_donnees/weekly/difference_from_average_precipitation/
Data Product Specification (English)	PDF		https://agriculture.canada.ca/atlas/data_donnees/nasdi/supportdocument_documentdesupport/en/ISO_19131_NASDI_-_Data_Product_Specification.pdf
Data Product Specification (French)	PDF		https://agriculture.canada.ca/atlas/data_donnees/nasdi/supportdocument_documentdesupport/fr/Série_nationale_indicateurs_agroclimatiques_dérivés_-_SPC_19131.pdf
Difference from average precipitation	Ersi REST		https://agriculture.canada.ca/imagery-images/rest/services/nasdi/difference_from_average_precipitation/ImageServer
Difference from average precipitation	Ersi REST		https://agriculture.canada.ca/imagery-images/rest/services/sniad/ecart_par_rapport_aux_precipitations_moyennes/ImageServer

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