Detailed method: (*Firstly, you must have got a save file.) Open the game.sii file under My Documents\Euro Truck Simulator\save\SAVENAME\game.sii, find out this line:
stored_weather_change_status: 0
just replace the '0' with '1', and save it. then, everything should be all right, just enter the game to enjoy it.
hey , can you tell how to open .Sii files
hello, please use notepad software to open it, you'll find it in Accessories.