Crop (corn) heat units (ESRI REST)
Crop (corn) heat units: ESRI REST file. From Agriculture and Agri-Food Canada, updated Jul 2025. View metadata, licence and the direct download on CanQuery.
- Format
- ESRI REST
- Access
- Original download only
- Publisher-reported update
- 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.
Data overview
- Formats
- ESRI REST
- Available actions
- Access original file