The 2009 growing season finished off May a bit cool, with degree day accumulations for only one of the nine crop reporting districts, west central, besting its long-term average. May was marginally cooler in the east, although that is not a problem, and crops are off to a great start statewide.
Iowa State University
Pope, Richard O., "Degree days - Crops in Good Condition Despite Cool Temperatures" (2009). Integrated Crop Management News. 636.
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