Arnold, MO: how dark is the sky here?
Arnold reads as suburban edge on this dataset's scale. A noticeable glow near the horizon. Brighter stars and constellations are easy to pick out; the Milky Way is washed out. Only 22.3% of the 3,206 cities measured here read darker than Arnold.
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 Arnold
Wildwood, MO, about 19 miles away as the crow flies, measures in the rural band, one step darker than Arnold. Actual driving distance will run longer than that straight-line figure.
Wildwood, MO is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Arnold compares nationally
About 21,036 people live in Arnold, MO, sized enough to appear in this dataset of 3,206 incorporated US cities. Arnold places 713 of 3,206 cities in this dataset's darkest-to-brightest order.