Dr. Joe Lauer, UW-Madison Agronomy and Extension State Corn Specialist
View the latest weather summary for 2019 and the Normal (30 previous years – 1989 to 2018) at Arlington and Marshfield from April 1 to September 3.
Note: A predictive corn GDU model was added to the Arlington and Marshfield graphs (bottom right). The graph describes the number of GDUs remaining to achieve R5 and R6 before a killing frost. If average GDUs accumulate normally, then corn (105 d RM = full-season) planted at Arlington prior to June 1 should achieve the R5 stage before an average killing frost. At Marshfield, corn (95 d RM = full-season), GDU accumulation has been slower than normal for all planting dates, except July 1. Corn planted prior to June 1 should achieve the R5 stage by a killing frost.
You can also download graphs for the current year and other years at http://corn.agronomy.wisc.edu/Season/. Links to current and previous season weather summaries are located on the left of the web page.