On my 2012 non-navigation CT is is weirdly in the odometer. When you cycle through the odometer/trip odometer displays, one is the outside temperature. I don't know who designed this whole interface, but it's lousy. To get even a basic trip computer in 2012 you had to buy the (lousy) navigation unit, which I was not willing to do.
Found it right after I posted the question ( of course ). Today I learned how to adjust the outside thermometer thanks to the instructions in the owner's manual but no where does it indicate where it is displayed.