I have some of the best summer tires you can buy (RE-01R's) and they turn into hockey pucks at cold temperatures. My performance winters are far FAR better at 30F than the summer tires on totally dry roads. Wet roads + cold weather + summer tires is another deathtrap as they firm up even more quickly and can be very poor even at 40F. And nothing I'm talking about has anything to do with snow. Snow, clearly, is not even comparable.
Winter performance tires when it's 40 degrees outside are not going to handle like summer tires when it's 70 degrees outside. If you're expecting anything like that, it's not going to happen. There will be a massive step down in performance between when you're driving around in the summer and when you're driving around in the winter no matter what you do (unless you buy all seasons, then it'll always suck). Performance winters just help minimize the step down and also give you a reasonable tire in the snow as well.
2015 STi: Still Stock
04 STi, 04 WRX: SOLD