The porsche manual states not to lower in temps less than 0 degree centagrade it is. You could have a top changed to an aftermarket glass window, or do the later year conversion that has a glass window.
I live in a climate where in the am morning is 15 or less in the spring since the car is in the garage ambient around 18 or so I just open it and go.
Some other guys in colder climate can chime in with better info for you.
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2000 Boxster S Ocean Blue Metalic
Last edited by Cunningr; 06-14-2018 at 08:27 AM.
Reason: Verified operating temp correcting
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