Diary of a Wimpy Kid Book 13: Hot Winter by Jeff Kinney

When Greg Heffley's school is closed due to a snowfall, the entire neighborhood becomes a winter battlefield. Rival groups compete for territory, build sturdy snow forts, and engage in epic snowball fights. And in the crossfire, Greg and his trusty best friend, Rowley Jefferson, find themselves. Greg and Rowley maneuver between allies, traitors, and warring gangs in a battle for survival that has engulfed the entire neighborhood. When the snow clears, will they emerge as heroes? Will they survive to see another day?