Year to Date Rainfall

Springfield has been reporting below average rainfall for the year.  It did not seem possible to me so I checked out NOAA records.  The above map from NOAA shows above average precipitation in our area although Springfield is certainly blow average.  South and east of us is even more above average.  The gray areas are average.  Does any of this correlate well with crop yields?   I think our southern neighbors took a  pretty big yield hit in corn because of the  high rainfall.  I am not sure how the dry weather to the north affected crop yields.