My comment below:
We plant and grow crops like corn in tightly packed rows that are now twice as dense as they were 40 years ago. This has resulted in a micro climate in the Midwest, several weeks after the majority of the corn plants have emerged. The massive increase in evapotranspiration from these plants, has increased low level moisture, with dew points in some situations, more than 5 deg. higher over several states.
This is affecting numerous other elements.
1. More daytime heating from the sun goes into evaporation and humid air masses have a higher heat capacity, so daytime Maximums are lower.
2. At night its just the opposite. Minimums are often set by how low the dew point is. If the dew point stays above 75, the lowest temperature will never drop to 75, for instance.
3. Increased low level moisture will increase instability of the air mass. More thunderstorms, potentially more severe/intensity.
4. Increased low level moisture from evapotranspiration will provide additional water vapor for weather systems to generate rains more often, along with heavier amounts. This becomes part of a positive feedback loop.
More corn =more evapotranspiration=higher dew points=more rain=more soil moisture=more evapotranspiration......and so on.
Then we start if all over again.
Here's more:
Corn and climate change
https://www.marketforum.com/forum/topic/18987/