Hi Joe!
Thank you very much. I think I figured it out already; as long as I stand in LFPG, the weather of the surrounding (near) airports is the same. This is because of limitations of the weather theme mode that Opus uses. You can not set the weather at stations, you can only set it for a certain tile. Opus updates the weather as your flight progresses...
However, I was not able to solve my issue, because I was using FSX ATC und AI and ATC assigned me the wrong approach (because the weather was not yet set at the airports) and AI took off on wrong runways...
Bernd