@Meyerweb I also wish Apple provided this by default. I have been using xbar (or SwiftBar) so that I can run scripts and output results in the menu bar. This is the one I use for temperature:
echo "$(curl -s 'wttr.in/Minneapolis?m&format=%t')/$(curl -s 'wttr.in/Minneapolis?u&format=%t')" | tr -d '+'
@Meyerweb Yeah, the wttr.in docs has quite a bit of formatting options. There's also a ton of plugins out there with varying levels of complexity if you're looking to add other such things to the menu bar.