Solar radiation

Predicted and climatological daily average solar radiation or insolation on the surface. Significant deviations between graph curves mean more or less cloudiness expected with regards to past decade.

Forecast history, days ago:

Solar radiation that reaches the earth's surface also called solar irradiation, solar exposure, solar insolation, or insolation. It is measured by the amount of solar energy received per square metre. Amount of solar energy received over the planet’s surface varies according to season, latitude, transparency of the atmosphere (including cloudiness), and aspect or ground slope. In the long term forecast it mainly represent a future cloudiness regime for a certain location. Therefore, the presented forecast can also be considered a long-term forecast of cloudiness.