Granite City, IL Night Sky Brightness
How dark is the sky in Granite City, IL?
Satellite radiance puts Granite City in the suburban band. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. Granite City's sky is brighter than 73% 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.
Where to go for a darker sky near Granite City
The closest place in this dataset with a meaningfully darker sky is Bellefontaine Neighbors, MO, roughly 6 miles away in a straight line, rated suburban edge. Road distance will be more.
Bellefontaine Neighbors, MO is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
Granite City against the rest of the dataset
Granite City, IL counts roughly 26,854 residents, among the 3,206 US cities this site tracks. Ranked against the other 3,206 cities here by the methodology guide's own sampling, Granite City comes in at 2,326, darkest to brightest.