The month of June opened with a cool week, with about 80 percent of the normal heat accumulated between May 31 and June 7. Although a bit warmer weather would accelerate crop development, Iowa crops are progressing nicely in most areas. Statewide, we have received about 90 percent of the heat for corn and soybean growth as in an average year. We are now 44 base-50 degree days behind average.
Iowa State University
Pope, Richard O., "Degree Days - Cool is cool" (2009). Integrated Crop Management News. 641.
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