Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download AllSky – 200+ Sky / Skybox Set Free.
AllSky – 200 Sky Skybox Set v4.0 (Latest version)
A full palette of 200+ skies for Unity! Provided as 6-sided cubemaps sized from x1024 to x2048 per-side along with an equirectangular cubemap texture from 4k to 16k in size. Each has an example lighting setup scene!
– Various styles: Day, Night, Cartoon, Fantasy, Hazy, Epic, Space, Sunless and Moonless!
– For lighting artists, environment artists and indie developers looking for a wide suite of skies to light their environments.
– Lighting from day to night: Twilight, sunset, multiple times of day, multiple times of night, skyglow.
– Many weather and cloud types: Clear, overcast, summery, stormy, autumnal, hazy, epic, foggy, cumulus.
New in Version 4!
– AllSky now contains over 200 skies.
– Each sky includes both its equirectangular and 6-sided versions.