Joliet, IL Night Sky Brightness
Joliet, IL's night sky, measured from orbit
Joliet's sky measures urban here. Sky glow overhead most nights. Typically only planets, the Moon, and a handful of the brightest stars are visible. That's brighter than 92% of the 3,206 US cities in this dataset.
Note the source: a satellite reading of upward light, not a visual Bortle scale reading. The two measure related but different things, explained in the Bortle scale guide.
The nearest darker sky to Joliet
Shorewood, IL, about 3 miles away as the crow flies, measures in the suburban band, one step darker than Joliet. Actual driving distance will run longer than that straight-line figure.
Shorewood, IL is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Joliet compares nationally
About 151,837 people live in Joliet, IL, sized enough to appear in this dataset of 3,206 incorporated US cities. Joliet's position, 2,933 of 3,206, darkest to brightest, comes from the sampling method the methodology guide sets out.