How low can you go topless

[litteng]

was about -10 deg C, clear and dry, great trip into the office, but as soon as the snow flys , the black sheep went into hibernation...

[Gary_d]

Top, what top? That's why I have a convertible....
Only time it doesn't go out is when it's physically raining or snowing, then I take one of the Jags or the Jeep.

[shadrach74]

40 is about what I consider reasonable and comfortable with the heater blasting. I've not had any issues with the plastic rear window...