Did you know that you don’t use the degree sign when you write the wind chill?
Here’s the whole paragraph:
With the new [as of 2001] formula, Environment Canada began reporting wind chill as an index stripped of units, so that a calculated wind chill of, say, -30°C is communicated simply as -30. “The current index is expressed in temperature-like units because it is the format that was preferred by most Canadians,” says the agency. “However, since the wind chill index is not actually a real temperature but, rather, represents the feeling of cold on your skin, it is reported without the degree sign.”
https://www.wunderground.com/cat6/How-Wind-Chill-Got-Started-and-What-Its-Doing-US-Midwest
So there you have it.
To make the degree sign, by the way, hold down the Alt key while you type 0176 on the numeric keypad. So 40° below, for example. On a Mac, it’s Option-Shift 8.