There's not much that will keep me off the course. I've lived in Ely, MN, wasn't disc golfing at the time, but I learned to live in the cold (regularly below zero, often -30 or colder, coldest I saw was -58F). Coldest I've played was -12F, or -30F windchill, no amount of snow will keep me off the course, I've been known to play with baskets completely buried.
Part of me wants to go back north just so I can DG in more extreme weather.
In reality it depends on how motivated I am, if I was planning on DG for a certain time I won't let anything stop me. If I'm sitting around bored I'm less likely to head out to the course in below zero/windy weather than say 25* and sunny. Which is perfect this time of year if you ask me. 25* it's easy to stay warm with minimal layers, but the snow isn't melting and sticking to discs and the ground is getting sloppy.
Which brings me to my next point, I'm more of a sally when it comes to sloppy nasty, than I am cold weather. If I'm likely to need more than 3 towels, F that.