You know, that almost gets me to the Gorham line. I could do that.
The differences can be stark, in any direction, across town, for sure. I do worry sometimes about continuity of records given my location compared to the previous observer. But I think if you were to compare my CoCoRaHS observations from 2018-2021, I'd be pretty close to the official obs (at least statistically).
Once in a while there'll be a season (or big event) where the difference is statistically significant, and that stinks, but what can you do?