During the rare cold snaps in which the high here is in the teens, I've tested our EV. So-called "fast" charging is way slow (a normal 10-15 minute charge took over 45 minutes). Not a problem for daily driving because home charging handles daily driving anyway; I just wanted to test what long trip charging would be like in bitter cold. And instead of getting 3.9 miles/kWh on average I got about 2.8 miles/kWh (normal local speed driving). So there are some real issues with charging speed and range in bitter cold. But, again, those are for long trips and not local daily driving.
Chicago had a polar vortex either last winter or the year before. It was fast charging Armageddon. The battery has to be preconditioned before it will even start to take a charge. I watched a YouTube video of a Wisconsin Tesla owner that left his Tesla parked at a supercharging site for 24 hours and then tried to charge it. It took about a hour or so before the battery would even take a charge and then about 90 minutes to charge it. Temp was something like -8F..