Fernley's reading looks wrong, and this site says so rather than hide it
Fernley's satellite reading came back at exactly zero, which is not a real measurement for a city of 25,508 people, it means the sample point most likely missed the lit part of town, landing on open water, a shadowed hillside, or just a bad coordinate. Real cities this size do not read true zero.
This is flagged instead of shown as a normal result because reporting it as "Fernley's dark sky" would be reporting a data error as a fact, see the data quality guide for how this gets checked.
The nearest reliable reading to Fernley
Sparks, NV is about 28 miles from Fernley and has a trustworthy reading: suburban edge band. It's the closest usable stand-in until Fernley's own figure is corrected.
Because Fernley's own coordinate is what produced the bad reading, that distance figure is itself approximate, not a confirmed measurement.
Fernley against the rest of the dataset
Fernley, NV has a population of about 25,508, one of 3,206 US cities in this dataset, 3,187 of which have a usable brightness reading today.