YozoraAtlas

How dark is the sky in Asturias?

Sky darkness for 7 towns and parks in Asturias, worked out from NASA satellite images of light at night (2025). 4 of them have skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is Somiedo Natural Park (21.52, Bortle 4), the brightest Oviedo (18.66, Bortle 7). Milky Way season in Asturias runs April to August: on moonless nights the bright core stands clear of the horizon, climbing to about 18° 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 Asturias with every place marked

Darkest skies in Asturias

  1. Somiedo Natural ParkBortle 421.52
  2. Las Ubiñas-La Mesa Natural ParkBortle 421.49
  3. Redes Natural ParkBortle 421.34
  4. Fuentes del Narcea Natural ParkBortle 421.02

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 Asturias

  1. OviedoBortle 718.66
  2. AvilésBortle 718.73
  3. GijónBortle 619.06

All 7 places in Asturias

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Avilés7Fuentes del Narcea Natural Park4Gijón6Las Ubiñas-La Mesa Natural Park4Oviedo7Redes Natural Park4Somiedo Natural Park4