look in settings there is a button for snow
it PROBABLY WOULD WORK!!!
Viewing post in Is there is any way to disable winter season effects in 0.9.0b?
The button was for DEMO snow mode, which is now no longer a thing in 0.9 because seasons have been implemented. The button you're talking about no longer exists in 0.9.
Sorry Maksymus84, the snow is from the Christmas event, which currently cannot be turned off even by changing the season in the saves screen, and can only be rid of by changing the date of your computer to be November. A LOT of people have been having FPS issues with it, so I'm sure the devs know about it by now.