Warm it up

Living in South Florida, this doesn't happen often but it was 45 degrees when I got in my car this morning. That got me thinking - how cold does it have to be for you to "warm up" your car before driving it?
Have a Gallardo Spyder on sunny Ocean Drive for your time. Bonus points for whoever can ID the yellow car in the foreground (I don't know what it is so I can't say if you are correct or not, but I'm sure someone here will have it correctly ID'd within 10 seconds)