Janesville, WI Night Sky Brightness
What the night sky looks like over Janesville, WI
Satellite radiance puts Janesville in the suburban band. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. That's brighter than 44.5% of the 3,206 US cities in this dataset.
The number comes from orbit, not a stargazer's logbook, so treat it as an estimate of sky glow rather than a certified Bortle class - the Bortle scale guide covers why.
Where to go for a darker sky near Janesville
Roscoe, IL, about 18 miles away as the crow flies, measures in the suburban edge band, one step darker than Janesville. Actual driving distance will run longer than that straight-line figure.
Roscoe, IL is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
Janesville against the rest of the dataset
About 66,428 people live in Janesville, WI, sized enough to appear in this dataset of 3,206 incorporated US cities. Among all 3,206 cities here, Janesville ranks 1,419 from darkest to brightest, 1 being the darkest measured, by the sampling the methodology guide documents.