Farhenhiet and Celsius are equally made up. All measurement systems that we use on human scales are made up. And in this case, farhenhiet is actually just better. More granular and more useful on a day to day basis. Yeah, it doesn't have the freezing point of an arbitrary substance as the 0, nor the boiling point of an arbitrary substance at 100, but it has temperature you should immediately be concerned about coming into contact with outside of -20 and 120, temperatures you should be concerned about contacting outside of 10 and 90, and fairly normal weather between those two.