Your own weather data
If you have measurements from a station at the site (or from another source), you can upload them and use them instead of the PVGIS data. They are saved in a database of measurements so you can reuse them in other projects.
Supported formats
CSV, TXT or Excel files. The engine recognises the columns by their name and unit and shows them to you for confirmation:
| Variable | Recognised units |
|---|---|
| Global (GHI), diffuse (DHI) and direct (DNI) irradiance | W/m², Wh/m², kWh/m², MJ/m², kJ/m², J/cm² (per interval) |
| Ambient temperature | °C, K, °F |
| Wind speed | m/s, km/h, kn, mph |
| Relative humidity | % |
What it does with your data
It always converts your measurements to the same typical year of 8,760 hours in UTC that the engine uses, so the charts and the analysis do not break whatever the period:
- Several years: they are averaged (month, day, hour) into a mean year.
- One year: it is used as is (without 29 February).
- Less than a year: the rest is filled with PVGIS TMY and you are told the actual percentage that comes from your file. A minimum of 30 days is needed.
- Data every 1, 5, 10, 15, 20 or 30 minutes: averaged into hours.
- Gaps: gaps of up to 3 hours are interpolated; long ones are filled with PVGIS TMY.
Good practice
- Check that the time in the file is what you think it is (local or UTC): there is an option to specify it.
- More years of data give a more representative climate. With a single year, you have that year, not the «typical» one.
Is something missing or wrong? Write to us at hola@radiaris.com. Last reviewed: 26 October 2026.