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... that's not to be. PA4s felt fine on a trip that started out in mild-for-December weather in NY to 85º in Alabama. Then there was a cold snap down there, and much of the return trip, from Virginia on, was in snow. They showed no discernible wear or compound deterioration.
Unfortunately for you, no PA (or any other high performance winter tire) is available in your size set; the only winter tire being these:
[url=https://www.tirerack.com/tires/tires.jsp?tireMake=Continental&tireModel=VikingContact+7&frontTire=055TR7VC7XL&rearTire=35TR7VC7XL&vehicleSearch=false&fromCompare1=yes]Viking[/url]
I would think they're more pure snow tires, and might feel very greasy on dry, especially hot, pavement, and very much unsuitable as an all-around tire for a Boxster.
Keep in mind TireRack isn't the only source for tires, and googling could be fruitful.
One last thing, if your car has PSM and it can be turned off, doing that might actually be helpful with summer (and winter) tires in uphill low traction situations.

... that's not to be. PA4s felt fine on a trip that started out in mild-for-December weather in NY to 85º in Alabama. Then there was a cold snap down there, and much of the return trip, from Virginia on, was in snow. They showed no discernible wear or compound deterioration.
Unfortunately for you, no PA (or any other high performance winter tire) is available in your size set; the only winter tire being these:
[url=https://www.tirerack.com/tires/tires.jsp?tireMake=Continental&tireModel=VikingContact+7&frontTire=055TR7VC7XL&rearTire=35TR7VC7XL&vehicleSearch=false&fromCompare1=yes]Viking[/url]
I would think they're more pure snow tires, and might feel very greasy on dry, especially hot, pavement, and very much unsuitable as an all-around tire for a Boxster.
Keep in mind TireRack isn't the only source for tires, and googling could be fruitful.