What is the effect of the cool to cold weather on crops in September?
Cold weather on corn
For corn, the influence of this cool weather is additional days to build yield by delaying crop maturity. However, by delaying maturity—black layers—later in the month of September, the crop will dry down more slowly, resulting in higher moistures at harvest time.
Cold weather on soybeans
For soybeans, this cool weather has very little effect on harvest timing. It could, however, reduce yields some.
Cold weather on crops
Both corn and soybeans will generally be killed by 28°F temperature for four hours. If the plant is killed by these cold temperatures prior to maturity, higher moistures in the grain will be seen.