well when i go to school in the mornings, lately it has been around 5-15 degrees. I start with the clutch engaged and the car immediately revs to about 1800rpm's, then it drops to 1200, and revs to 1800, it does this abuot 6 times then settles at around 1000rpms for a while, then idles down at its usual 500rpm.
the one thing that really pisses me off though is that the BMW CD changer won't work real well until its warmed up a bit, it even says in the manual that it won't function properly under 32 degrees fahrenheit.