See the full story at https://cropwatch.unl.edu/2016/2016-corn-yield-forecasts-july-13

Figure 3. Vertical lines indicate the range of 2016 corn yields forecasted on July 13 based on average planting date in 2016 at each location. Horizontal lines indicate the 25th and 75th percentiles of the yield distribution (associated with respective adverse and favorable weather scenarios during the rest of the season). Long-term (2005-2014) average yield at each location is indicated with a blue square. Separate charts are shown for irrigated corn (top) and rainfed corn (bottom).