How dark is the sky in Sun Prairie, WI?

Satellite radiance puts Sun Prairie in the suburban band. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. Sun Prairie's sky is brighter than 60.6% 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 Sun Prairie is from a meaningfully darker sky

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

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

Sun Prairie against the rest of the dataset

Sun Prairie, WI has a population of about 39,253, one of 3,206 US cities of 10,000 or more residents in this dataset. Among all 3,206 cities here, Sun Prairie ranks 1,931 from darkest to brightest, 1 being the darkest measured.