
An Iowa State analysis of soil moisture in six northwest Iowa locations found that stored subsoil moisture plus 80% of spring rainfall was below the roughly 20 inches needed for normal corn and soybean yields. The analysis projects moisture balances through early September using average rainfall expectations.
A moisture deficit in a major producing area raises the risk of below-trend yields unless rainfall beats average, which supports corn and soybean price risk premiums.
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.