For me “it’s now really hot” in summer is exactly when it’s over 30C. It being 86F doesn’t make any more sense. Approximately above 35C I will avoid going outside. Which would be 95F, not 100. From here, the temps in summer in the south of Europe are often around 100F at peak. Above or below doesn’t matter.

you guys need to stop converting directly between temperatures, you're right at 86f, bump it up to 90f and woah, suddenly it's actually a nice round number.

You're too conversion pilled to realize that the human experience isn't fundamentally and objectively representative. 1 degree celsius isn't super noticeable, just like 5 degrees fahrenheit isn't super noticeable either.