50°F is when I might start wearing pants instead if shorts. I will still be wearing a t-shirt, and won't bring a jacket until at least 40°F.

70°F is the hottest it can be outside before I become uncomfortably warm.

When I get in a hot tub that is at 100°F, I will turn it down to at least 95°F and know that I won't be able to stay much longer.

This is the other problem with Fahrenheit, there is no universal "100% hot". While Celsius doesn't have the granularity and is subject to "just ask water how it feels" criticism, at least "what temperature is water" is a consistent way to explain it as opposed to saying "at 100°, you'll be hot"