Their sensor always seems to read high in the summer…especially in higher dews. They’re an AWOS and those older sensors were notorious for that. EEN and LCI used to have that problem as well. But ASH averages a good 2-3° too high this time of year.
All of the airports are well mixed. We don’t live in the corn fields of Iowa. The vegetation is fairly uniform across the region. Most of the ASOS differences are due to frontal boundaries, ocean influence, or elevation.
I’m 615ft and my dew is too high usually too. I have a soaked yard with no air mixing. But even the sensors themselves seem to oversaturate in higher dewpoints. Our sensors calculate RH and calculates a dew from that. There’s some error. ASOS directly measures the dewpoint without an all-in-1 temp/hum sensor.
I’m not hot at all. Every night has been fine with the fans…low 70s at the worst. That bedroom temp is a little inflated in the afternoon because it’s on the west side. But I tolerate the warmth and dews just fine. Trust me it’ll go in when we feel like we need it.