I think this is pretty much ado about nothing. Don't forget ASOS's (at least "official" ones) use an averaging algorithm. Since benign conditions occur here as a norm, I watch me get warmer than the ASOS's around me in the morning hours (dew follows, whichever direction), mid day neck and neck, then I cool faster as the sun fades. I see this everyday. Not only, I've become more aware of how micro-climates affect readings, especially the dew (a simple, brief wind shift for instance), as I found water vapor in the air is more "transportable" than the temp, at least in my experience here.