Live Demo
A full 15-day forecast panorama rendered from real sample data (site HuaR_093, 36.35208°N / 102.95839°E, issued 2026-08-27 12:00 UTC). Switch time ranges and radiation conventions to see the data shape and conversion rules.
样例数据加载中…
Why two radiation conventions?
Radiation fields such as `tr` are energy density accumulated from the issue time (J/m²), monotonically increasing. The irradiance (W/m²) used in business is obtained by differencing: (accumulated end − accumulated start) ÷ interval seconds, i.e. ÷ 900 for 15-minute steps. The "15-min irradiance" chart above visualizes this conversion — nighttime plateaus difference to zero, which directly reveals sunrise / sunset periods. See Usage Notes.