Places to avoid: large areas of nice heat collecting rocks that radiate all that heat back into the air at night, looking over a roof or lots of roofs, looking over a multi-lane highway, setting up on bitumen...
Other bad spots can be low down or in a hollow, because that is where cold air collects and you'll get dewed out much quicker than if you're on the higher end of a slope.
To me local seeing is all about the air over your head and that is largely controlled by the weather, so just being familiar with the local weather patterns and effects it might cause would be good. I'd also want to avoid a place that gets very windy - perhaps you're in a mountain area that gets descending winds or a valley that funnels the wind.
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