Hi and welcome to the forums.
Seems that no one else is replying to your question so thought I'd say something. From my understanding, observing near large bodies of water helps to steady the "seeing" because such bodies of water don't heat up as much as the land during the day and don't cool as much at night. The decrease in temperature variation of the water compared to the land means less temperature induced heat plumes over the water, hence steadier seeing. Humidity is less a factor in determining the seeing conditions than temperature differences.
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