This is NOT a watchface - it's a watch app. It has the the basic stuff for a watchface and looks like one, but includes the temperature from a Tempe Sensor. Times can be 12/24hr, Temp in F or C.
12/24hr and F/C are controlled by the system settings on your watch (12/24 is in "clock", and F/C in "units, temperature units")
PLEASE NOTE: When you start the app, it can take a minute or two before the temperature is displayed, as the Tempe only transmits that often.
Also displayed are the high and low temperatures for the day, but ONLY from the times this app is running. (but are saved for the day - they reset when the day has changed)
The screen is updated every minute (like low power mode of a watchface), but on a device with a touch screen, if you tap the screen, it updates every second (and shows seconds) for 15-20 seconds.