Ok, I installed the 655 beta build, I can't say it solves the problem, but there is some improvement. There's still interpolation and it's still hooked to the same Antarctica stations. The Vatsim weather metars are still not correctly used, even with the option selected and ASE flight plan loaded, however some of the ASE data now matches vatsm metars or is closer to it than it used to be (qnh, temps). At least I haven't seen snow since the update, which is certainly an improvement. I'll keep an eye on that region for the future and will keep comparing the weather, hopefully this will get a more polished solution in future builds. Screenshot with the weather details in the latest beta build below:http://imageshack.us/f/705/asenz2.png/