Weoo pretty much nailed it.
Summer=No school
No School=More Videogames
More Videogames=Higher chance of discovering Toribash
Knowing how this game is going the amount of players will increase minorly in the summer. And considering this game is more addictive than most drugs, those players will stick to the game, and not be completely horrible
http://steamcharts.com/app/248570#All
It's interesting stuff to look at. Feel free to drag your own conclusions. Maybe check it again in summer and let us know your findings.