Johnstown, CO Night Sky Brightness
Johnstown, CO's night sky, measured from orbit
Johnstown reads as rural on this dataset's scale. Little local light dome. Most stars are visible; the Milky Way is faint but often findable away from town lights. Johnstown's sky is brighter than 4.8% of the 3,206 cities in this dataset.
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.
The nearest darker sky to Johnstown
9 miles from Johnstown, straight-line, sits Evans, CO, the nearest city here with a darker sky than Johnstown's own rural band.
Evans, CO is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Johnstown compares nationally
Johnstown, CO has a population of about 20,639, one of 3,206 US cities of 10,000 or more residents in this dataset. Johnstown's position, 155 of 3,206, darkest to brightest, comes from the sampling method the methodology guide sets out.