Smart choice. Even when the temps were hovering in the mid 40's I couldn't get any traction under moderate boost. I basically resorted to the shift light in the car to drive. Scary in the corners and I was worried about braking distance. 45F is the magic number to switch to winter tires.
I even switched to economy mode on my AP unit, just to limit torque, and protect my super soft winter tires from being worn too quickly from aggressive driving.