Via OpenWeatherMap I learned about the OpenMeteoData.org, that has the aim to make meteorological data available for everyone.
From the website: "
What is OpenMeteoData?
OpenMeteoData is an non-profit organization. We aim to make meteorological data available for everyone. We are now building our own supercomputer to calculate open weather forecasts. We run the Weather Research and Forecast (WRF) model. This is state of the art numerical weather prediction tool, developed by several major universities and US governmental agencies.
In most Europeans countries, weather data is not freely available. You have to pay hundreds of thousand euros to get access to raw model outputs.
Who can use the data?
Everyone. It's free. That's just like Wikipedia or OpenStreetMap. [...] We plan to release all of the data under Open Database Licence (ODbL). That means the data is free, and it can be used for both personal and commercial projects.
When will it be available?
If everything goes right, a first preview is expected for March 2013."