No idea, how can I change it to be blizzlike, nor do I know if it's some kind of spell/object etc. So I decided to report it here, since Oregon aims to be blizzlike.
Take a look at this video for example: https://www.youtube.com/watch?v=aPF3PibH2_M
You can see the instance is "MORE DARKER" which builds a good atmosphere, what it is now is a normal lightning which every instance uses as of now. It's a trivial thing, but I think it is also a good one to build a climate of the instance.