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Welcome to Cornell Cooperative Extension of Westchester County
Growing Degree Days
BASE 50 GROWING DEGREE DAYS ACCUMULATED AT WESTCHESTER COUNTY AIRPORT
Last Week: 201
Since March 15, 2013: 1452
Last Season: 1627
Seasonal Departure: 140 (5 days)
What are Growing Degree Days?
Growing degree days (GDDs) as applied to the control of insect/arachnid pests of landscape plants are a measure of accumulated heat calculated by subtracting 50 degrees from the average daily temperature. GDDs may be calculated by plant scientists and other plant specialists using a base other than 50 degrees. In New York State, calculations are made from March to the end of September. Knowing the amount of accumulated GDDs helps plant proffessionals and home gardeners monitor stages of insect/arachnid pest activity or target control to a stage when the pest is most vulnerable.
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