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Defining Agricultural Seasons in the Middle Latitudes¹

Synopsis: This study classifies the annual timetable of climatic change into natural agricultural seasons. The classificational criterion used is based on the responses of various field crops to the distribution of daily maximum and minimum temperatures, within weekly periods.

² Assistant Professor of Agronomy and Agricultural Climatology, Purdue University, Lafayette, Ind., and Research Associate, Dept. of Meteorology, University of Wisconsin, Madison.