Westminster, CO Night Sky Brightness
How dark is the sky in Westminster, CO?
Satellite radiance puts Westminster in the suburban edge band. A noticeable glow near the horizon. Brighter stars and constellations are easy to pick out; the Milky Way is washed out. Only 36.4% of the 3,206 cities measured here read darker than Westminster.
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, covered fully in the Bortle scale guide.
How far Westminster is from a meaningfully darker sky
Arvada, CO, about 6 miles away as the crow flies, measures in the rural band, one step darker than Westminster. Actual driving distance will run longer than that straight-line figure.
Arvada, CO is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
Westminster against the rest of the dataset
Westminster, CO has a population of about 115,302, one of 3,206 US cities of 10,000 or more residents in this dataset. Ranked against the other 3,206 cities here by the methodology guide's own sampling, Westminster comes in at 1,162, darkest to brightest.