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Botanical Terms - accumulated temperature
the total, expressed in degrees, by which the real air temperature fluctuates over an extended period of time above or below a datum level. Typically, the datum level is established at a temperature that is pertinent to agricultural production or ecological research (for example, 6°C is the essential temperature for sustained plant growth). The accumulated temperature for a given day is mn/24 degree-days if the mean temperature is m° above or below (−m°) the datum level and stays there for n hours (= n/24 days). To find the total temperature over a week, month, season, or year, simply add the degree-days.
the total, expressed in degrees, by which the real air temperature fluctuates over an extended period of time above or below a datum level. Typically, the datum level is established at a temperature that is pertinent to agricultural production or ecological research (for example, 6°C is the essential temperature for sustained plant growth). The accumulated temperature for a given day is mn/24 degree-days if the mean temperature is m° above or below (−m°) the datum level and stays there for n hours (= n/24 days). To find the total temperature over a week, month, season, or year, simply add the degree-days.
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