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After an early planting start, a warm, wet May was followed by a heat wave in the Midwest. The article explains that corn's heat tolerance depends mainly on soil moisture and root health, with heat most damaging near pollination.
Heat stress during pollination would threaten yields, but the impact depends on water supply, so the price signal is modest unless dryness spreads.
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.
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.