Chambersburg, PA: how dark is the sky here?
Satellite radiance puts Chambersburg in the suburban band. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. That's brighter than 82.8% of the 3,206 US cities in this dataset.
This comes from a satellite measuring light radiating upward, not a person's eyes on the ground, so it isn't the same as a Bortle class, though the two track each other closely.
The nearest darker sky to Chambersburg
The closest place in this dataset with a meaningfully darker sky is Carlisle, PA, roughly 30 miles away in a straight line, rated suburban edge. Road distance will be more.
Carlisle, PA is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Chambersburg compares nationally
Chambersburg, PA has a population of about 23,041, one of 3,206 US cities of 10,000 or more residents in this dataset. Chambersburg places 2,639 of 3,206 cities in this dataset's darkest-to-brightest order.