Description

Crop Heat Units (CHU) are calculated on a daily basis, using the maximum and minimum temperatures in order to account for a crop’s negative response to higher temperatures. The formula used to calculate the CHU value for a day is: (1.8 × (Minimum Temperature − 4.4) + 3.33 × (Maximum Temperature − 10) − 0.084 × (Maximum Temperature − 10)²) ÷ 2.0 CHU values are only accumulated during the Growing Season, April 1 through October 31.

Resources

Name	Format	Description	Link
Agroclimate Interactive Maps (French)	HTML		https://agriculture.canada.ca/atlas/agclimat
Agroclimate Interactive Maps (English)	HTML		https://agriculture.canada.ca/atlas/agclimate
Pre-packaged GeoTIF files (No linguistic component)	Unknown		https://agriculture.canada.ca/atlas/data_donnees/agClimate/data_donnees/tif/ch/
Data Product Specification (English)	PDF		https://agriculture.canada.ca/atlas/data_donnees/agClimate/supportdocument_documentdesupport/en/ISO_19131_AgClimate_-_Data_Product_Specification.pdf
Using AAFC Climate Services (English)	PDF		https://agriculture.canada.ca/atlas/data_donnees/agClimate/supportdocument_documentdesupport/en/Using%20AAFC%20Climate%20Services.pdf
Data Product Specification (French)	PDF		https://agriculture.canada.ca/atlas/data_donnees/agClimate/supportdocument_documentdesupport/fr/Donnees_agroclimat_-_SPC.pdf
Using AAFC Climate Services (French)	PDF		https://agriculture.canada.ca/atlas/data_donnees/agClimate/supportdocument_documentdesupport/fr/Utilisation%20des%20services%20climatologiques%20d'AAC.pdf
Crop (corn) heat units	Ersi REST		https://agriculture.canada.ca/imagery-images/rest/services/agclimate/crop_heat_units/ImageServer
Crop (Corn) Heat Units	Ersi REST		https://agriculture.canada.ca/imagery-images/rest/services/agclimat/unites_thermiques_de_croissance/ImageServer

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