1974-75 : EARLY COLD SPELLS AND FROST IN SEPTEMBER
1980-81 : THE JULY 1980 U.S. HEAT WAVE
1983-84 : THE U.S. DROUGHT OF 1983
1988-89 : THE U.S. DROUGHT OF 1988
1993-94 : UNFAVORABLE CONDITIONS IN SOME KEY AREAS,
THE GREAT FLOOD OF 1993
1995-96 : WET WEATHER DELAYS PLANTING,
THE JULY 1995 U.S. HEAT WAVE
2007-08 : THE INCREASE IN CORN PLANTED ACRES IS CAUSED BY INCREASED DEMAND FROM ETHANOL PRODUCERS AND STRONG EXPORTS SALES, ARE ENCOURAGING FARMERS TO PLANT MORE ACRES TO CORN.
2012-13 : THE U.S. DROUGHT OF 2012
2016-17 : THE INCREASE IN CORN PLANTED ACRES IS MAINLY DUE TO THE EXPECTATION OF HIGHER RETURNS IN 2016 COMPARED WITH OTHER CROPS.
2019-20 : 2019 MIDWESTERN U.S. FLOODS
WET WEATHER DELAYS PLANTING