Empirically, my wife can perceive a 0° change on a bad day. The same temperature can be too hot and too cold at the same time. That said, I have never encountered a situation where 1°F makes any difference. If somebody feels bad, it takes at least 2-3°F change to make them feel good again. Celsius is granular enough for that. All workplace safety and food safety regulations in Europe are expressed in whole, non-fractional degrees Celsius.
What's so special about the number 50? Why aren't you comparing to 40°C instead? 40°C is a more useful boundary than both 50°C and 100°F.
What's so special about the number 50? Why aren't you comparing to 40°C instead? 40°C is a more useful boundary than both 50°C and 100°F.