So how is Snowy Escape going to work without Seasons?

Pretty sure that if you don't have Seasons installed, it will just be always snow on the ground and sunny. With Seasons, you will likely get active falling snow, blizzards at times and feel the cold effects. We will find out more in the coming week(s) but for now, that's how I'd assume it works. Very much like Sulani works, just opposite.