Casper, WY: how dark is the sky here?

Casper's sky measures suburban here. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. Only 77.1% of the 3,206 cities measured here read darker than Casper.

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.

How far Casper is from a meaningfully darker sky

Laramie, WY, about 112 miles away as the crow flies, measures in the rural band, one step darker than Casper. Actual driving distance will run longer than that straight-line figure.

Laramie, WY is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.

How Casper compares nationally

Casper, WY has a population of about 58,823, one of 3,206 US cities of 10,000 or more residents in this dataset. Casper places 2,458 of 3,206 cities in this dataset's darkest-to-brightest order.