It shouldn't matter that much in that case too, especially if you have home charging. The lowest I have gone is minus 40 F during a cold snap last year. I had no problems starting up the car and going. The acceleration/regen was limited for a bit in the beginning to protect the battery. I lived in an apartment at the time and so I couldn't "pre-condition" the battery and interior from wall-power. But even then I had no problems after everything warmed up. Sure I used a bit more energy at the beginning to warm up the interior since I couldn't plug in.

On longer trips, the waste heat from motors are cycled through the battery to bring it to ideal temperatures. Even in extreme cold weather, you get full "regen" capability (meaning battery is warmed up), just from the waste heat from the motors. There is also an option to pre-condition the battery for fast charging by intentionally driving the motors less efficiently to generate more heat.