Rio Grande City, TX Night Sky Brightness
Rio Grande City, TX's night sky, measured from orbit
Satellite radiance puts Rio Grande City in the suburban band. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. Only 56% of the 3,206 cities measured here read darker than Rio Grande City.
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.
How far Rio Grande City is from a meaningfully darker sky
12 miles from Rio Grande City, straight-line, sits Roma, TX, the nearest city here with a darker sky than Rio Grande City's own suburban band.
Roma, TX is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Rio Grande City compares nationally
Rio Grande City, TX has a population of about 15,526, one of 3,206 US cities of 10,000 or more residents in this dataset. Rio Grande City's position, 1,785 of 3,206, darkest to brightest, comes from the sampling method the methodology guide sets out.