

You are fooled by your own habits. Most of the world uses °C just fine and why wouldn’ they? The steps of one °C are just what starts to be relevant in daily life. Yes you would totally say it has 13°C and not round up to 5 or 10s. The latter you would only do if your unit system has more precision than is needed.
That said, if you want more precision just say 13.4°C. Some wearher forecasts do that but it is really not very releant what comes after the comma for daily weather forecast needs.



I rarely see the need for less precision. If you don’t know the precise temperature you say “around” if you want to describe a range, you just do that “x-y”. Easy.
Like I said, you and I are used to our temperature unit systems, neither is inherently more user friendly than the either.