In metric world nobody cares about decimal points in temperature outside. Measuring precision is not that good because of wind, humidity, exposure to sun etc. We just don’t need that granularity, so it is really hard to understand why would you need that. Is there really any difference between 56°F and 57°F that you can feel and want to measure?

And choice of 0/100 for weather is absolutely baseless. You do have below-zero days and in some places it can be over 100. With Celsius you know when it’s going to be ice on the roads and when rain becomes snow.