Well the temperature has finally dropped to -20c or -4f here in Montreal with lots of snow and ice.
It seems that preconditioning will warm the battery to a temperature range that I don't understand. At -20c it only warms the battery pack to -2c or 28.4f (verified on 3 separate preconditioning). These are set departure time preconditioning.
I'm including graph images from my EVSE for your enjoyment. This image shows the entire charge and preconditioning.
This image is an expanded view of the charge portion.
This image is an expanded view of the preconditioning portion.
Edit: Corrected my assumption about the temperature shown on the Juicebox App (Jan 06 7:32AM)
The service menu shows a battery temp of -2c or 28.4f, another effect of the colder pack is the greatly reduced recapture braking force and much higher kWh/100km numbers to maintain any kind of speed. The battery pack does reach +10c within 15 or so minutes of driving.