In my first colony, I set the temperature units in the options to Fahrenheit. This worked as expected.
Upon creating a second colony, the temperature was displayed in Celcius, even though the settings showed Fahrenheit was still selected.
To fix issue, I had to set units to C, close settings, open settings, set to F.
Steps to Reproduce
Create colony Set temperature units in settings to Fahrenheit. Restart game. Create new colony. Observe temperature units in tooltips.
Status: Known Issue
We are aware of this issue and have it logged internally but either we do not have a fix ready yet or we are not planning on addressing the issue in the immediate future.