YozoraAtlas

How dark is the sky in Ústí nad Labem Region?

Sky darkness for 10 towns and parks in Ústí nad Labem Region, worked out from NASA satellite images of light at night (2025). 3 of them have skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is České Švýcarsko National Park (21.25, Bortle 4), the brightest Ústí nad Labem (19.17, Bortle 6). The bright core of the Milky Way never climbs clear of the horizon haze anywhere in Ústí nad Labem Region while the sky is fully dark; the rest of the band passes overhead, with the longest moonless nights from September to March.

19 Bortle class, 1 pristine to 9 city center park or dark-sky place city

Numbers like 21.95 or 16.97 are the brightness of the sky overhead on a clear, moonless night, in mag/arcsec². The scale runs backwards: a lower number means a brighter sky, from about 22 for a natural sky to about 17 in a city center.
How the readings are made

NASA satellite night-lights map of Ústí nad Labem Region with every place marked

Darkest skies in Ústí nad Labem Region

  1. České Švýcarsko National ParkBortle 421.25
  2. Labské pískovce Protected Landscape AreaBortle 421.14
  3. Lužické hory Protected Landscape AreaBortle 421.13

Among the places on this site. Plenty of land between them is just as dark, with no town or park to name it by.

Brightest city skies in Ústí nad Labem Region

  1. Ústí nad LabemBortle 619.17
  2. TepliceBortle 619.26
  3. ChomutovBortle 619.50
  4. MostBortle 519.56
  5. DěčínBortle 519.63

All 10 places in Ústí nad Labem Region

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Chomutov6Děčín5Labské pískovce Protected Landscape Area4Litoměřice5Litvínov5Lužické hory Protected Landscape Area4Most5Teplice6Ústí nad Labem6České Švýcarsko National Park4