(NB: The "Housepoint System" mod includes its own "Auto Season" system so if you have that mod installed you should not install this one.)

By default the game changes season each time you complete a Keeper's Trial. But if you make rapid progress you can end up with Winter (including Xmas decorations) in September. Instead, this mod automatically sets the in-game season (and decorations) appropriate to the in-game month:

Sep-Nov = Autumn/Fall + Halloween decorations in Oct.
Dec-Feb = Winter + Christmas decorations in Dec.
Mar-May = Spring
Jun-Aug = Summer

The time, date, and season will be displayed on-screen if you press ALT-e. This will also force the mod to immediately refresh the season. The mod cannot be used at the same time as the "Season Picker" mod.

The key bind can be changed by amending this file:

C:\Users\YourUserName\AppData\Local\Hogwarts Legacy\Saved\Config\WindowsNoEditor\Input.ini

Change the True/False/Key=E parts of this line:

ActionMappings=(ActionName="AutoSeason_Execute",bShift=False,bCtrl=False,bAlt=True,bCmd=False,Key=E,GroupName="",SortIndex=0)

If the above line doesn't exist, add it.