Gurnee, IL Night Sky Brightness
How dark is the sky in Gurnee, IL?
Gurnee reads as urban on this dataset's scale. Sky glow overhead most nights. Typically only planets, the Moon, and a handful of the brightest stars are visible. Gurnee's sky is brighter than 96.6% of the 3,206 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 Gurnee
The closest place in this dataset with a meaningfully darker sky is Waukegan, IL, roughly 3 miles away in a straight line, rated suburban. Road distance will be more.
Waukegan, IL is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
Gurnee against the rest of the dataset
Gurnee, IL has a population of about 30,546, 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, Gurnee comes in at 3,081, darkest to brightest.