Download iCEnhancer v3.0 here (source)
Download the Weather Control script used in this video here
Installation:
-iCEnhancer (Read the readme.txt)
-Weather Control: Extract the files to GTA Scripts folder (Scripthook needed)
Hotkeys
-iCEnhancer (Read the readme.txt)
-Weather Control: Insert - Show mods menu.
You can change the hotkey in the self-generated .ini file
Credits
iCEnhancer v3.0 by Ice La Glace
ENB by Boris Vorontsov
Weather Control script by JulioNIB
Screens