My weather app said the sky would be clear. I taught an open model to check, then went outside
This is a submission for the Hacktoberfest Open-Source AI Challenge Week 1: Touch Grass Every stargazer knows this evening. The app says clear . You find the warm jacket, drive out past the streetlights, let your eyes adjust for twenty minutes… and look up at a flat grey lid. Cloud cover is the one number that decides whether going outside at night is worth it, and it's the number weather apps…
Cloud cover is the deciding factor for whether going outside at night is worth it, and weather apps often get this wrong. The author, a systems engineer, decided to build a solution to address this issue. He created Clear Tonight, an open-source tool that compares the cloud forecast from a weather app with a model trained on the forecast's historical accuracy for a specific location.
This model, called TabPFN v2, reduces the error in the forecast by 28-41% over a year's worth of data from six different cities. The tool provides a verdict for tonight, an hour-by-hour comparison of the app's prediction and the actual chance of clear skies, and a moon phase indicator. Additionally, the author built a local version of the tool that can be trained on personal location data and generate a short plan based on the results.
The project includes a live page for six cities and a sky-photo log that uses Gemma 4 to rate the cloud cover in user-provided photos. The code is available on GitHub, and a demo video showcases the tool's functionality.
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