Chelsea, MA Night Sky Brightness
How dark is the sky in Chelsea, MA?
Satellite radiance puts Chelsea in the inner-city band. Among the brightest skies in this dataset. Usually just the Moon and a few of the brightest stars or planets cut through. That's brighter than 99.4% 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, covered fully in the Bortle scale guide.
The nearest darker sky to Chelsea
Everett, MA, about 1 miles away as the crow flies, measures in the urban band, one step darker than Chelsea. Actual driving distance will run longer than that straight-line figure.
Everett, MA is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
Chelsea against the rest of the dataset
Chelsea, MA has a population of about 40,245, 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, Chelsea comes in at 3,170, darkest to brightest.