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Corn Sweat: Is Your Cornfield Making Summer Stickier?
28 Jul
Summary
- Corn sweat describes evapotranspiration, where corn releases water vapor.
- This moisture increases humidity and dew points, worsening muggy conditions.
- There is no official 'corn sweat' measurement; experts track humidity.

Residents in the Mid-Atlantic, particularly New Jersey, may be familiar with various weather phenomena, and "corn sweat" could be the next concern. This term commonly describes evapotranspiration, a natural process where corn plants absorb water and release it as vapor through their leaves into the atmosphere.
The moisture released by cornfields can elevate humidity and dew points, intensifying the muggy feeling of hot summer days. Experts note that while "corn sweat" is a colloquial term, the underlying process is scientifically recognized and contributes to local weather conditions.
Unlike specific measurements for air quality or wet-bulb temperatures, there is no direct public "corn sweat" index. Meteorologists instead rely on readings of humidity and dew points, which can indicate the additional atmospheric moisture originating from crops like corn.
It's important to recognize that corn is only one contributor to summer humidity. Other factors, such as moisture from the Gulf of Mexico, other types of vegetation, and large-scale weather systems, also play significant roles in creating muggy conditions.