How dark is the sky in Greenfield, WI?

Greenfield's sky measures suburban here. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. Greenfield's sky is brighter than 78.8% 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.

How far Greenfield is from a meaningfully darker sky

The closest place in this dataset with a meaningfully darker sky is Franklin, WI, roughly 5 miles away in a straight line, rated suburban edge. Road distance will be more.

Franklin, WI is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.

Greenfield against the rest of the dataset

Greenfield, WI counts roughly 37,232 residents, among the 3,206 US cities this site tracks. Among all 3,206 cities here, Greenfield ranks 2,512 from darkest to brightest, 1 being the darkest measured.