I personally use one a few blocks away because our hyperlocal weather is odd. I think a lot depends on how well the owner maintains it. I don’t know the owner of the station I use, but they seem to maintain it well, because it’s always online and agrees closely with what I observe out my windows. That’s the key: pick one that’s closely agrees with what you observe yourself.
The ultimate accuracy is to get your own station, like the Tempest system that Rachio is offering now. If you can’t find a reliable and accurate nearby station, and you’re handy with DIY, that would be the most accurate hyperlocal weather you can possibly have.