# Excessive rainfall as damaging to corn yield as extreme heat, drought | Around the County | Illinois Extension | Illinois

> A University of Illinois study using county-level crop insurance data from 1981 through 2016 found excessive rainfall reduced U.S. corn yields by as much as 34% relative to expected yield in some years. Drought and extreme heat caused losses of up to 37% in some years. The findings were published in Global Change Biology.

- Date: 2019-04-30 · published 2019-04-30T12:00:00.000Z
- Category: weather · region US · magnitude low
- Page: https://feedsoft.ai/events/58933-excessive-rainfall-as-damaging-to-corn-yield-as-extreme-heat-drought-around-the
- Commodities: [Corn](https://feedsoft.ai/c/CORN.md), [Soybeans](https://feedsoft.ai/c/SOY.md)

## Why it matters

The study frames excess rain as a yield risk comparable to drought, reinforcing concern over the current flood-delayed Midwest crop and supporting firmer corn prices.

## Read by commodity

- SOY: bullish ▲
- CORN: bullish ▲

## Similar past events

| Commodity | Date | Event | 5-day % | 20-day % |
| --- | --- | --- | --- | --- |
| CORN | 2023-08-30 | [Extreme heat, drought take toll on US crops \| World Grain](https://feedsoft.ai/events/13254-extreme-heat-drought-take-toll-on-us-crops-world-grain.md) | -0.0% | -8.2% |
| CORN | 2017-07-18 | [Corn market figures in lower yields \| Illinois Extension \| Illinois](https://feedsoft.ai/events/69795-corn-market-figures-in-lower-yields-illinois-extension-illinois.md) | +0.4% | -2.4% |
| CORN | 2023-07-27 | [How Extreme Heat Can Affect Corn Yield](https://feedsoft.ai/events/13265-how-extreme-heat-can-affect-corn-yield.md) | -13.2% | -14.2% |
| CORN | 2024-06-20 | [Extreme heat wave raises concerns around US corn harvest \| Agriculture Dive](https://feedsoft.ai/events/13177-extreme-heat-wave-raises-concerns-around-us-corn-harvest-agriculture-dive.md) | -6.0% | -9.5% |
| CORN | 2021-06-18 | [Drought Expands in Iowa, Stressing Crops- as Soybean and Corn Prices Tumble \| Farm Policy News \| Illinois](https://feedsoft.ai/events/46422-drought-expands-in-iowa-stressing-crops-as-soybean-and-corn-prices-tumble-farm.md) | +0.3% | -5.2% |
| SOY | 2023-08-30 | [Extreme heat, drought take toll on US crops \| World Grain](https://feedsoft.ai/events/13254-extreme-heat-drought-take-toll-on-us-crops-world-grain.md) | -1.6% | -5.7% |
| SOY | 2021-06-18 | [Drought Expands in Iowa, Stressing Crops- as Soybean and Corn Prices Tumble \| Farm Policy News \| Illinois](https://feedsoft.ai/events/46422-drought-expands-in-iowa-stressing-crops-as-soybean-and-corn-prices-tumble-farm.md) | +3.1% | +9.4% |
| SOY | 2025-12-19 | [2025: Year of Extreme Weather, Corn Disease and Worry in Illinois - Field Advisor](https://feedsoft.ai/events/13033-2025-year-of-extreme-weather-corn-disease-and-worry-in-illinois-field-advisor.md) | +0.6% | +0.1% |

## Sources

- extension.illinois.edu: https://extension.illinois.edu/blogs/around-county/2019-05-01-excessive-rainfall-damaging-corn-yield-extreme-heat-drought
- enn.com: https://www.enn.com/articles/57812-excessive-rainfall-as-damaging-to-corn-yield-as-extreme-heat-drought
- eurekalert.org: https://www.eurekalert.org/news-releases/736377

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Data from Feedsoft AI (https://feedsoft.ai/). For information only; not investment advice.