How dark is the sky in Rialto, CA?

Satellite radiance puts Rialto in the suburban band. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. That's brighter than 55.9% 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.

The nearest darker sky to Rialto

The closest place in this dataset with a meaningfully darker sky is Loma Linda, CA, roughly 10 miles away in a straight line, rated suburban edge. Road distance will be more.

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

Rialto against the rest of the dataset

About 104,918 people live in Rialto, CA, sized enough to appear in this dataset of 3,206 incorporated US cities. Among all 3,206 cities here, Rialto ranks 1,782 from darkest to brightest, 1 being the darkest measured.