YozoraAtlas

How dark is the sky in Extremadura?

Sky darkness for 5 towns and parks in Extremadura, worked out from NASA satellite images of light at night (2025). 2 of them have skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is Monfragüe National Park (21.60, Bortle 4), the brightest Badajoz (18.97, Bortle 6). Milky Way season in Extremadura runs March to September: on moonless nights the bright core stands clear of the horizon, climbing to about 22° at its highest.

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 Extremadura with every place marked

Darkest skies in Extremadura

  1. Monfragüe National ParkBortle 421.60
  2. Tajo Internacional Natural ParkBortle 421.60

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 Extremadura

  1. BadajozBortle 618.97
  2. MéridaBortle 619.22
  3. CáceresBortle 619.32

All 5 places in Extremadura

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Badajoz6Cáceres6Monfragüe National Park4Mérida6Tajo Internacional Natural Park4