...and just FYI, BNA is not the center of the UHI. Oak Hill has no commercial or industrial development therefore very little influence from the UHI and the Airport can be cooler than me on occasions. In addition to concrete and asphalt, heavily wooded areas (like mine) often don't radiationally cool as well as flat wide open areas due to lack of ventilation.
I had a light wind overnight last night so I only hit 13º. I hit 11.7 yesterday morning.