
Heavy rains of 2 to 5 inches from September 18 to 20 flooded fields across eastern South Dakota, northern Iowa, southern Minnesota, and southern Wisconsin, delaying harvest and creating crop loss risk. The area accounts for about 10% of US corn and soybean production.
Harvest delays and possible losses in a region holding about a tenth of US output could tighten supplies, though analysts say the market is muted by record expectations.
After 1,465 past bullish weather events, Corn moved a median +0.2% over 5 sessions (54% higher; middle half -1.4% to +1.9%), and +0.9% over 20.
After 1,079 past bullish weather events, Soybeans moved a median +0.3% over 5 sessions (54% higher; middle half -1.4% to +2.0%), and +0.9% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.