I don't understand that some people here are so opposed to the idea to have real-time weather in what claims to be the most realistic military flight simulation.
I don't think that the realtime weather should be the only option either. But, if I create a mission now, putting a carrier in the black sea area, I want to be able to select realtime weather for it.
If the weather then is nice, great. If the weather sucks, rain, fog and/or wind, now you have to make all kinds of decisions regarding attack profile, choice of weapons, and many more considerations.
That, in my mind, creates the ultimate simulation of the real-world situation. For historic scenarios you should be able to set it to whatever you want.