Just paired a new Third Reality Temp/Humidity sensor as title notes. This guy...
On the Device page, Current States temp is in F, Preferences setting for temp reporting is in C. There is no Preference option to choose F or C as overall temp scale. Just defaults this way.
This has always been the case and same with the SmartThings Humidity and Hue Motion drivers. But the state temp values are always reported in the Temp Scale setting on the Hub Details page.