API Response
Data Source
KNMI provides weather forecasts from the HARMONIE AROME model with ECMWF IFS initialization. This is a collaboration of multiple European national weather services under the name "United Weather Centres-West" (UWC-West). Two model configuration one for Europe (5.5 km resolution) and an inset for the Netherlands (2 km resolution) are available. All data is updated hourly and provides forecast for up to 2.5 days. After 2.5 days, Open-Meteo combines forecasts with the ECMWF IFS 0.25° model to provide up to 10 days of forecast.
| Weather Model | Region | Spatial Resolution | Temporal Resolution | Forecast Length | Update frequency |
|---|---|---|---|---|---|
| KNMI HARMONIE AROME Netherlands | Netherlands, Belgium | 2 km | 1-hourly | 2.5 days | Every hour |
| KNMI HARMONIE AROME Europe | Central & Northern Europe up to Iceland | 5.5 km | 1-hourly | 2.5 days | Every hour |
API Documentation
For a detailed list of all available weather variables please refer to the general Weather Forecast API. Only notable remarks are listed below
- Solar Radiation: KNMI supplies only global solar radiation data and does not offer direct or diffuse solar radiation. Open-Meteo applies the separation model from Razo, Müller Witwer to calculate direct radiation from shortwave solar radiation.
- Wind Direction Correction: Wind direction has been calculated from U/V wind component vectors. Special care has been taken to correct for the Rotated Lat Long projection. Without this correction, wind directions have an error of up to 15°.
- Wind on 50, 100, 200, 300m: Wind forecasts for higher altitudes are only available for the Netherlands area.
- Pressure Level Data: Forecasts on pressure level are only available for the European model.