Using AAFC Climate Services (French) (PDF)
Using AAFC Climate Services (French): French PDF file. From Agriculture and Agri-Food Canada, updated Jul 2025. View metadata, licence and the direct download on CanQuery.
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- 2025-07-21
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.
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