For what it's worth...I live rural at an elevation of 855m. However, I do see a lot more cloud than many, and I also live not too far from a coal mining area, where a lot of the residents (mostly the older ones) still have coal burners. Depending on the wind direction, that can sometimes add a faint layer of haze, particularly in the winter months.
While the elevation does help - the days tend to be cooler, and there's a lot less heat haze to deal with in the evenings - the overall geography still has to be taken into consideration.
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