What the night sky looks like over St. Marys, PA

St. Marys's sky measures dark sky here. Among the darkest skies of any US city in this dataset. The Milky Way should be visible overhead on clear, moonless nights. That's brighter than 0.5% 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.

St. Marys is already about as dark as this dataset gets

Nothing in this dataset's 3,206 US cities measures a darker sky than St. Marys. 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.

St. Marys against the rest of the dataset

St. Marys, PA counts roughly 12,361 residents, among the 3,206 US cities this site tracks. Among all 3,206 cities here, St. Marys ranks 16 from darkest to brightest, 1 being the darkest measured.