Glendale Heights, IL Night Sky Brightness
Glendale Heights, IL's night sky, measured from orbit
Glendale Heights's sky measures suburban here. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. That's brighter than 65% 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.
How far Glendale Heights is from a meaningfully darker sky
Carol Stream, IL, about 3 miles away as the crow flies, measures in the suburban edge band, one step darker than Glendale Heights. Actual driving distance will run longer than that straight-line figure.
Carol Stream, 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 Glendale Heights compares nationally
Glendale Heights, IL counts roughly 32,866 residents, among the 3,206 US cities this site tracks. Glendale Heights's position, 2,073 of 3,206, darkest to brightest, comes from the sampling method the methodology guide sets out.