Waltham, MA's night sky, measured from orbit
Waltham 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. That's brighter than 29.8% of the 3,206 US 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.
Where to go for a darker sky near Waltham
Framingham, MA, about 11 miles away as the crow flies, measures in the rural band, one step darker than Waltham. Actual driving distance will run longer than that straight-line figure.
Framingham, MA is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Waltham compares nationally
Waltham, MA has a population of about 65,849, one of 3,206 US cities of 10,000 or more residents in this dataset. Waltham places 952 of 3,206 cities in this dataset's darkest-to-brightest order.