Open-source full-year climate visualizations: 30-year normals for any city, rendered as a single static ribbon chart.
Weather Ribbon is an open-source climate visualization site: each city page renders 30-year normals (1991–2020) for temperature, precipitation, snowfall, humidity, cloud cover, wind and daylight as static SVG charts — one "seasonal climate ribbon" per city. All data is pre-fetched from MERRA-2 (via NASA POWER) and CAMS (via Open-Meteo) and committed to the repo, so the site runs with zero runtime API calls and no ads.
Fully vibe coded with a local agent arenaThe author launched it on Show HN in October 2026 with a simple note: "Fully vibe coded using Agent Duel (a local coding agent arena)." The README confirms it: "Weatherribbon was built using Agent Duel" — and the sponsor section notes Agent Duel covers the hosting costs.
Why it stands outIt's a rare thing on the web: a fast, fully static, open data-viz site with no tracking and no paywall. MIT licensed, accepting contributions for new cities — a clean example of vibe coding producing a genuinely useful public utility.