By caching the weather state, the developers ensure that if you quit the game during a tense, lightning-heavy boss fight, you return to that same electric atmosphere. It preserves the of your journey. It remembers that the ground is currently muddy, that the puddles are deep, and that the fog hasn't lifted yet. The Narrative of Data

The "SaveData" portion is where the magic of persistence happens. Without this file, every time you reloaded a game, the sky would reset to a generic blue.

There is a certain poetry in how a computer translates "mood" into "math." To the player, the weather is a feeling—the gloom of a rainy afternoon in an RPG or the blinding heat of a desert survival game. To WeatherSystemSaveData.json , that feeling is a collection of integers and booleans.