What the night sky looks like over Port Royal, SC

Satellite radiance puts Port Royal in the dark sky band. Among the darkest skies of any US city in this dataset. The Milky Way should be visible overhead on clear, moonless nights. Only 1.5% of the 3,206 cities measured here read darker than Port Royal.

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.

Port Royal is already about as dark as this dataset gets

Nothing in this dataset's 3,206 US cities measures a darker sky than Port Royal. That doesn't mean nowhere is darker, unincorporated land and wilderness aren't part of this dataset at all, only incorporated cities of 10,000 people or more.

Port Royal against the rest of the dataset

Port Royal, SC has a population of about 16,507, one of 3,206 US cities of 10,000 or more residents in this dataset. Among all 3,206 cities here, Port Royal ranks 50 from darkest to brightest, 1 being the darkest measured.