A static tree visualization renders hierarchical weather data with three seasonal branches, each containing three related weather conditions. The example demonstrates loading D3 v5 via UNPKG and importing ES6 modules. Using `d3.tree()` and `d3.hierarchy`, it computes node positions and draws curved links with cubic Bézier paths (`C` commands) between parent and child nodes. SVG circles and text labels show each node, with labels offset above or below based on whether a node has children.