Sounds a daft question, I know, but I'm a switcher who used to use ASCII tables. I need to type the symbol for degrees F or C several times a day. Does anyone know how I can do this? Mine's a MacBook Air.
At least I assume that this º is the symbol you're looking for.
If you go under System Preferences->International and click on the Input Menu tab you can enable the Keyboard viewer which will show the characters available when different modifier keys are pressed.