Markets are still trying to figure out the impact of 2019 weather on crop production and historical references only make it partially easier. Prices in the U.S. have been as volatile as the weather, shooting skyward when incessant spring rains descended and now stabilized lower as conditions have moderated. Now Europe faces its second heat wave of the summer with temperatures expected to rise 10 degrees Centigrade above normal. However, past moisture may carry the crop through.  Since the year 2000, Europe has experienced hot and dry summers four times (2003, 2010, 2013 and 2015). However, smaller crop production was experienced more in 2003 and in 2007, a non-drought summer (see graph below). None of the four events has been consider...