Rosemead, CA Night Sky Brightness
Rosemead, CA: how dark is the sky here?
Rosemead reads as suburban on this dataset's scale. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. Only 75.3% of the 3,206 cities measured here read darker than Rosemead.
This comes from a satellite measuring light radiating upward, not a person's eyes on the ground, so it isn't the same as a Bortle class, though the two track each other closely - see the Bortle scale guide for where they can disagree.
How far Rosemead is from a meaningfully darker sky
4 miles from Rosemead, straight-line, sits San Marino, CA, the nearest city here with a darker sky than Rosemead's own suburban band.
San Marino, CA is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Rosemead compares nationally
Rosemead, CA has a population of about 49,582, one of 3,206 US cities of 10,000 or more residents in this dataset. Rosemead places 2,400 of 3,206 cities in this dataset's darkest-to-brightest order, ranked by the method in the methodology guide.