Grafton, WI Night Sky Brightness
How dark is the sky in Grafton, WI?
Grafton's sky measures suburban here. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. Only 56.6% of the 3,206 cities measured here read darker than Grafton.
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 Grafton
5 miles from Grafton, straight-line, sits Port Washington, WI, the nearest city here with a darker sky than Grafton's own suburban band.
Port Washington, WI is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
Grafton against the rest of the dataset
About 12,741 people live in Grafton, WI, sized enough to appear in this dataset of 3,206 incorporated US cities. Ranked against the other 3,206 cities here by the methodology guide's own sampling, Grafton comes in at 1,807, darkest to brightest.