Who on earth wants to provide the option to see the weather in Kelvin?

[tenders]

If Apple was being cute with control-K for the degree symbol in MacOS, they were a little too cute for their own good.

The Kelvin scale is technically not in "degrees" the way Celsius and Fahrenheit scales are. The unit is just "Kelvin."

So absolute zero is 0 K, not 0 degrees K. But absolute zero IS, correctly, -273 degrees C.