| # | City | Bortle (est.) | Brightness | 2 classes darker |
|---|---|---|---|---|
| 1 | Prague | 8–9 | 255 | ~25 km S |
| 2 | Ostrava | 7–8 | 255 | ~25 km W |
| 3 | Brno | 7–8 | 255 | ~25 km NE |
| 4 | Olomouc | 7–8 | 255 | ~25 km ENE |
| 5 | Pilsen | 7–8 | 255 | ~25 km ESE |
| 6 | Most | 7–8 | 252 | ~25 km NW |
| 7 | Pardubice | 7–8 | 242 | ~25 km S |
| 8 | Kladno | 7–8 | 250 | ~25 km SW |
| 9 | Liberec | 7–8 | 255 | ~25 km E |
| 10 | Hradec Králové | 7–8 | 255 | ~25 km NNW |
| 11 | Frýdek-Místek | 7–8 | 255 | ~25 km SSE |
| 12 | Ústí nad Labem | 7–8 | 255 | ~25 km WNW |
| 13 | České Budějovice | 6–7 | 255 | ~25 km SSE |
| 14 | Zlín | 6–7 | 245 | ~25 km E |
| 15 | Opava | 6–7 | 246 | ~25 km SSW |
| 16 | Jihlava | 6–7 | 249 | ~25 km SW |
Brightness is the NASA VIIRS Black Marble 2016 value at the city centre on a 0–255 scale; 255 is saturated. Cities are ordered by estimated sky brightness, which also counts the light within 30 km.