@chris is correct and another point is that someone tried running UWG with zero built-up environment to was curious why it didn’t revert back to the airport condition (Urban Heat Island in an "all-green" scenario). Some of the assumptions behind TEB means that it doesn’t work very well for areas that do not have urban canyon geometries defined.
If you do have specific location in mind, do feel free to try EPW generated from ERA5 data (Weather Data Downloader) to compare - ERA5 Renalysis is derived from observational measurements and filtering it through numerical weather prediction model to do just what @chris mentioned, earth surface energy balance according to our understanding of atmospheric physics process.
Note that the ERA5 model takes into account surface vegetation type (some parameters are available such as low/high vegetation coverage) but this information doesn’t get included in the EPW file that’s generated and it doesn’t take into account urban surface type - I think it’s actually assumed as flat low-vegetation for urban areas.
Disclaimer - I run the downloader app and you do need to sign up but you should be able to get up to 6 EPW files for free per month.