This question already has an answer here:
In common use today, we have two different temperature measurements. Degrees Celsius, and Fahrenheit.
In cooking books is usual to have all temperatures specified like: "180C (356F)" or "365F (180C)", depending on where they are published.
Very few of us can readily think in both. So questions/answers tend to use one or the other.
I feel like it wouldn't be too hard to perform a little (extremely basic) natural language processing, and automatically recognise when someone is talking about a temperature in one unit, and then automatically convert it to the other. Placing the results in brackets.
The Community User is the stack exchange bot that does several useful things, including editing posts in very limited ways (it does for example put in a "possible duplicate of" link). A bot could be set up do this task -- which would mean it doesn't break the normal editing process and would show in the edit history. It could be smart enough to not re-edit after its edit has been removed. (It could also be done without using a web crawler bot).
I feel like this could be done, with a very low rate of false positives. I think this would provide much utility. Very few other sites on the SE network care about temperature as much as we do.