Unsure of the weather in Zurich, but I moved from CA to WI, so I’m familiar with cold. :lol:
It wouldn’t be the end of the world to move in winter, especially if you have many blanket options and your barn is willing to be flexible while she adjusts. But if you have the option, spring would be kinder.
I would definitely get a wool blend quarter sheet. I love mine, and even use it on my clipped horse in the Bay Area. I use it to warm up, and then remove it, sometimes putting it back on for cool down if it’s really cold. But I also ride early in the AM. In WI, I would keep it on for the whole ride when it was very cold, but I find they pull, so I never jump in them. (If it’s warm enough to be safely jumping, it’s warm enough to remove the quarter sheet.)
Is your barn going to be heated? Check your stock of coolers. If you don’t clip, and then work in a heated arena, your horse might get surprisingly sweaty. And just like us, a wet horse turned back out cold (even with blankets) is uncomfortable - dangerous.
Snow pads are a thing. If your horse has shoes, you will want to get these added ASAP.
Ice is way worse than snow. Horses seem to love snow, even deep snow. It’s the ice you have to be careful of. (So warmer weather doesn’t necessarily equal better turnout.)
Talk to the barn owners while you’re touring. It’s probably not the first time they have dealt with this.