There is more a play here though. Our minimums have been increasingly warm, but haven’t had the extreme upper 90s/low 100s that we used to have. The obvious answer is that moist air cools and heats slower.
People on here like to pick on the Central Park reading three months of the year for temps, 3 months a year for snow, and ignore the problems for the other 6 months...But I would be curious to know if a densely forested park in the middle of an urban heat Island is experiencing this phenomenon to a greater degree.
The airports are easy; particularly LaGuardia and Newark...They are slabs of cement in densely populated areas. JFK is much larger, has much more open space with grass, is in a national park, and is abeam the Atlantic Ocean.
But I wonder if there is more to this than ASOS placement. Has anyone actually visited the ASOS recently and seen the conditions around it?