I have 5 rain gauges, 4 electronic (Davis) all calibrated over time to a CoCoRaHS manual 4" gauge. The map shows us as being in moderate drought, although my data shows we've had between 44.56" to 45.45". Confidence is high that this is an accurate range, and compared to previous years on this date, we're well within the normal rainfall range. I've been logging weather data for over 16 years, and doing so consistently for at least 10 years.
To see CoCoRaHS (Community Collaborative Rain Hail, and Snow) network data in thousands of locations, go here:
http://data.cocorahs.org/cocorahs/maps/You can purchase the CoCoRHaS rain gauge for about $30 plus shipping here:
http://www.weatheryourway.com/cocorahs/store.html (more expensive elsewhere), and the site has detailed instructions for taking accurate precipitation measurements.

Join the network if you like and submit daily or weekly reports for your specific location. The map, above, was likely made using (at least in part) CoCoRHaS data. Also includes Canada. Data is used by the weather services, non-governmental services, researchers, etc..
All of my data streams to various weather data collecting entities via CWOP/APRS (Citizen Weather Observation Program/Automatic Packet Reporting System). Enables high-resolution analysis of ongoing weather and climate data. CWOP does running assessments of data accuracy and reports anomalies. My systems seem to be quite accurate; well within their data quality parameters. All of this distributed/redundant data gives a pretty good picture of what's going on out there.