YozoraAtlasyo·zo·ra (夜空) n. [Jap.] night sky

How dark is the sky in Western Australia?

Sky darkness for 42 towns and parks in Western Australia, worked out from NASA satellite images of light at night (2025). 34 of them have skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is Cape Arid National Park (21.95, Bortle 2), the brightest Perth (17.75, Bortle 8). Milky Way season in Western Australia runs February to October: on moonless nights the bright core stands clear of the horizon, climbing to about 90° 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

All 42 places in Western Australia

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Albany6Alexander Morrison National Park2Avon Valley National Park4Badgingarra National Park3Beelu National Park5Boorabbin National Park2Bunbury6Busselton5Cape Arid National Park2Cape Le Grand National Park2Cape Range National Park2Eucla National Park2Fitzgerald River National Park2Francois Peron National Park2Frank Hann National Park2Geraldton6Kalbarri National Park2Kalgoorlie6Karijini National Park3Karlamilyi National Park2Leeuwin-Naturaliste National Park2Lesueur National Park2Mandurah6Moore River National Park3