Iray Sky Pro

Detail link: https://www.daz3d.com/iray-sky-pro

Iray Sky Pro is a large, layered prop that sits above your scenes and works in tandem with Iray's sun/sky system to produce realistic-looking skies. High-resolution cloud textures pulled directly from panoramic image captures are blended seamlessly together, in conjunction with lightweight shading for reasonable render times. Iray Sky Pro is very simple to use: load the sky pro prop, apply your cloud pattern, and select an appropriate environment preset.
Sun/sky environment presets are included, covering a range of color and light variations. These presets are not required, but you can adjust the time of day, intensity, or rotation of Iray's sun/sky mode and the Iray Sky Pro prop will work alongside those changes.