Tenki
Compare weather forecasts against observations across Japan.
Tenki is a Japanese-language web service that compares weather forecasts with observations across Japan.
- Weekly, monthly, annual and all-period forecast rankings
- National and location-based comparisons for temperature, precipitation probability and rain occurrence
- Local forecast comparisons and archived forecast history
- Sample counts, actual evaluation dates, sources and scoring methodology
Scores are evaluation metrics out of 100, not accuracy percentages. Annual and all-period rankings use the available stored data, and rankings are published only when the eligibility requirements are met.
The Tenki plugin for ChatGPT is available
Tenki 1.0.0 is available as a ChatGPT plugin, published by s21g Inc.
Use it to compare public forecasts for Japan and check forecast accuracy rankings, evaluation methods, and data freshness. It provides read-only access to public information.