DataWeatherOpen SourceAPI

ForecastCheck – Track Forecast Bias

Quantify local weather forecast error for planning, farming, and outdoor activities.

Problem
Many people suspect forecasts run cold, especially in summer when actual days end up hotter. Official agencies rarely publish searchable historical forecast bias, so users have only suspicion, not numbers.
Solution
Continuously collect official forecasts and actual observations for a location, compute temperature bias and precipitation hit rate by city, season, and forecast horizon, and surface how much the local forecast typically over- or under-predicts.
Users
Outdoor workers, runners and cyclists, farmers, event planners, and data-driven decision makers.
MVP
Scheduled scraping of public forecast and observation data; bias computation by city and horizon; simple charts and a today trust score; weekly email/push digest; multi-city comparison.
Revenue
Free basic lookup plus subscription for multi-city comparison, history export, and API access; usage-based API pricing for agriculture and event businesses.
Why now
Extreme weather is rising and public interest in forecast accuracy is high, but no one offers transparent bias tracking. Public data plus simple math makes it indie-friendly.

Source discussions · 1

  1. Hacker NewsShow HN: Error in official Swiss weather forecasts, recorded since September '251↑ 1
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