So you think it is temp proximity to dew point? Interesting thought. Obviously, dew point is the point when water vapor is the air condenses out into droplets. As temps and environmental conditions are not 100% uniform across an area, as you approach dew point, you will undoubtedly have spots/areas where dew condenses out first (lower temps or higher dew point) even though you don't have it happening everywhere. As with low areas and radiation fog that sometimes forms, you could get the condensing going on despite not reaching the dew point for the entire area. In other words, you may be close to dew point for the whole area, but in some localized areas, you are much closer or reaching dew point and so thermal conditions are much worse than you might experience if you were at the same humidity, but not close to dew point. So being close to dew point would not necessarily make things worse if you weren't in a localized spot where you are apt to reach dew point (such as low areas).
Also sounds plausible.
Also sounds plausible.
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