Norristown, PA Night Sky Brightness
Norristown, PA's night sky, measured from orbit
Satellite radiance puts Norristown in the urban band. Sky glow overhead most nights. Typically only planets, the Moon, and a handful of the brightest stars are visible. Only 85.6% of the 3,206 cities measured here read darker than Norristown.
Note the source: a satellite reading of upward light, not a visual Bortle scale reading. The two measure related but different things, explained in the Bortle scale guide.
Where to go for a darker sky near Norristown
9 miles from Norristown, straight-line, sits Lansdale, PA, the nearest city here with a darker sky than Norristown's own urban band.
Lansdale, 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 Norristown compares nationally
About 36,075 people live in Norristown, PA, sized enough to appear in this dataset of 3,206 incorporated US cities. Norristown's position, 2,729 of 3,206, darkest to brightest, comes from the sampling method the methodology guide sets out.