How dark is the sky in Danville, CA?

Satellite radiance puts Danville in the rural band. Little local light dome. Most stars are visible; the Milky Way is faint but often findable away from town lights. Danville's sky is brighter than 10.1% of the 3,206 cities in this dataset.

Worth remembering: this is satellite radiance, not a ground observation. A true Bortle rating needs a human eye at night, this is the closest large-scale substitute.

How far Danville is from a meaningfully darker sky

Truckee, CA, about 143 miles away as the crow flies, measures in the dark sky band, one step darker than Danville. Actual driving distance will run longer than that straight-line figure.

Truckee, CA is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.

Danville against the rest of the dataset

Danville, CA has a population of about 43,410, one of 3,206 US cities of 10,000 or more residents in this dataset. Among all 3,206 cities here, Danville ranks 322 from darkest to brightest, 1 being the darkest measured.