What causes this message to show up? In this case, my PWS does have a rain gauge but since I installed it over a month ago, it hasn't actually rained. Is the lack of it ever reporting rain why this is here?
Yes, I believe if it hasn't reported rain (ever) this is what you will see. Maybe try simulating rain and see what happens?
I considered simulating it but didn't want to pollute the data I guess I'll just wait until it rains in CA. That should be within a year or two.