Summer tire torn – now switch to winter tires?!?

Hello, I have the following question: The day before yesterday a tire (summer tire) is torn, the tires are no longer the best so that I would have to buy all 4 tires new. However, I wonder if it is still worth buying new summer tires this year. My consideration is this: Since I also need new winter tires this year I wanted to change to winter tires now and only next year new summer tires to grow. How do you see that? Does that make sense? Can (there) rf) can you ride with winter tires at temperatures?