 Created Fog.
You do get fog now, because your pond manufactures it when the temps are "just right". Basic mechanical/chemical engineering principle. Evapotranspiration takes place pretty much all day, but when the water temperature is slightly warmer then ambient the water vapor will cool just above the surface and re-condense as a result of "latent heat of evaporation", causing you to have your own private fog machine. If you had a thermometer sensitive enough you would find that the temperature at the fog/water transition point is 1deg cooler than the pond.
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