I dont have the DLCs (yet) and I want to play in the Spring but I see no option for it. Is the Spring only in the DLC or can I find it somewhere in game? I have 5.80 installed.
Early spring leave on Sokolovo and Rakitnoe maps.
Switch of course not available, the season is determined by the actions that take place on the map. If it takes place in winter - polygon has winter season, if in spring - has spring, etc.