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A simple way to calculate degree-days

Add daily minimum and maximum temperatures and divide by 2 to get the average daily temperature.

74°F + 54°F
2		 = 64°F

Subtract the lower threshold temperature (e.g., 53°F for the California red scale) from the average daily temperature. The result is the number of degree-days accumulated that day.

64°F - 53°F = 11°D

Statewide IPM Program, Agriculture and Natural Resources, University of California
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