Data Sources & Attribution
WeatherPeek does not fabricate weather observations or conceal upstream data provenance. Here is exactly how our data pipeline operates, where numbers originate, and how often models recalculate.
Primary Provider: Open-Meteo
Our core numerical data feed is provided by Open-Meteo (open-meteo.com), an open-source weather API service that normalizes and delivers weather model outputs from leading global meteorological organizations.
WeatherPeek proudly attributes weather data to Open-Meteo under the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0).
Underlying Atmospheric Models Ingested
European Centre for Medium-Range Weather Forecasts. Renowned globally as the gold standard for mid-range (3 to 10 day) synoptic accuracy. Updated twice daily.
United States National Oceanic and Atmospheric Administration. The High-Resolution Rapid Refresh (HRRR) runs hourly at 3 km grid resolution across North America.
Deutscher Wetterdienst (Germany). ICON-EU and ICON-Global run on icosahedral grids, delivering exceptional resolution across Europe and maritime zones.
Copernicus Atmosphere Monitoring Service provides satellite-derived and aerosol chemistry modeling for PM2.5, PM10, Ozone, NO2, and SO2.
Cache Lifecycles & Refresh Intervals
To prevent excessive load on upstream public scientific servers and provide fast response times:
- Forecast Data: Cached in WeatherPeek server edge proxy for 300 seconds (5 minutes) with stale-while-revalidate allowances.
- Air Quality Data: Cached for 600 seconds (10 minutes) to reflect atmospheric chemical updates.
- Geocoding Lookups: Cached for 3600 seconds (1 hour) as city coordinates and boundaries are static.
Known Coverage Limitations
While Open-Meteo covers the entire terrestrial globe, users should be aware of standard limitations:
- Microclimates: Steep alpine valleys, island coasts, and urban street canyons can deviate 2°–4° from the interpolated grid cell average.
- Air Quality Sensors: Certain rural coordinates lack ground monitoring stations; in such locations, values represent satellite aerosol column estimates rather than street-level intake monitors.
- Doppler Radar: WeatherPeek does not simulate or invent live Doppler radar animations, as radar requires costly high-bandwidth proprietary radar mosaic licensing.