Last night was the coldest yet for my Model S. 5F/-16C. It failed to charge overnight from my home 240V charge station, leaving me unable to get to work this morning. Grumble. I scheduled my charge for after midnight as usual. When I plugged in to the charger yesterday evening, I got the usual blinking green acknowledgement from the charge connector. But, the schedule time came, and nothing happened. The lesson I've learned: if it's going to be below 10F / -10C don't schedule your charge. Start the charge as soon as you park the car, so its battery, warmed up by use, will accept the energy. Tesla service suggested using the app to warm up the car's cabin shortly before the charge is supposed to start. That isn't going to work for me. The car did let me charge it during the day today. I do have the cold weather package, etc. I wonder if they need to add the EV equivalent of an engine block heater? Or maybe I should just move to the Bay Area in California?