Download Time of Day FREE Unity. 

Time of Day is a package to render realistic dynamic skydomes with day and night cycle, realistic celestials, dynamic clouds and physically-based atmospheric scattering.

Sky:
– Physically based sky shading
– Rayleigh & Mie scattering
– Highly customizable
– Sun and moon god rays
– Aerial perspective

Lighting:
– Full PBR & HDR support
– Realtime ambient light
– Realtime reflections

Clouds:
– Physically based cloud shading
– Semi-volumetric cloud layers
– Dynamically batched cloud billboards
– Adjustable wind speed & direction
– Configurable coverage and shading
– Correctly projected cloud shadows