Sorry to see that you having such an issue. I’ve known about occasional false data showing up in the transfer from weather underground, more on this here (link), but daily rain readings showing up 10 times smaller than they should is something new. I’ll try to investigate it, and let you know what I find.
Edit: It is definitely an issue with WU, here is what I’m getting via API (link), note the time of the data point is at 3:20PM, but it still reporting false rain data (just 0.02in / 1mm).
I’ll try to expedite one of the fixes I was considering, stay tuned.
Gene