How dark is the sky in Atascadero, CA?

Atascadero reads as dark sky on this dataset's scale. Among the darkest skies of any US city in this dataset. The Milky Way should be visible overhead on clear, moonless nights. That's brighter than 1% of the 3,206 US 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.

Atascadero is already about as dark as this dataset gets

Nothing in this dataset's 3,206 US cities measures a darker sky than Atascadero. That doesn't mean nowhere is darker, unincorporated land and wilderness aren't part of this dataset at all, only incorporated cities of 10,000 people or more.

Atascadero against the rest of the dataset

Atascadero, CA counts roughly 29,743 residents, among the 3,206 US cities this site tracks. Among all 3,206 cities here, Atascadero ranks 33 from darkest to brightest, 1 being the darkest measured.