Piva Weather mod v2.6 (v1.5.x) for American Truck Simulator game.

Version 2.6
Now with skybox model

Added clouds shadows
Changed far fog
Changed brightness
Changed specular color for chrome support
Support climates

New in Version 2.5
HDR settings updated. Reduced overbright effect.
For daytime mod used hdr.sii file use hdr.default at morning and hdr.08 for day.
Critical values of target_white and traget_gray parameters write with normal numbers
So you can update it on you taste.
target_gray - if bigger then color is more bright
traget_white - if bigger then color is less bright
Bloom not used
Added support for some climates

dalton
default
desert
middle
reference
south
tropical
winter <- now unused

Tested on game version 1.5.x