Calculating Degree-Day Heat Units
Maturation and ripening of grapes depend on the amount of heat available to the plants during the growing season. The amount of heat required is different for different cultivars. Table 2 gives recommended cultivars’ heat requirements as the number of degree-day heat units required between April and October to mature a crop.
Calculate heat units for a given day by adding the maximum and minimum temperatures for that day and dividing by two. From this figure, subtract 50°F(10°C) to obtain the number of heat units. For example, if the maximum temperature for a given day is 85°F and the minimum is 55°F, you would calculate that day’s heat units as follows:
(85 + 55)/2 = 70
70-50 = 20 degree-day heat units.
The heat units for each day from April through September are added to find the seasonal heat units for that particular site. Heat units for selected Idaho locations appear in table 3. To get temperature information for other locations, contact State Climate Services, University of Idaho, Moscow, ID 83844- 0904; (208) 885-7004.
Idaho Univ.
http://www.cals.uidaho.edu/edComm/pdf/CIS/CIS1043.pdf
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